Rotary drilling rig double-driving-force system with self-circulation cooling function

Abstract

The invention discloses a rotary drilling rig dual-driving-force system with a self-circulation cooling function. According to the rotary drilling rig dual-driving-force system, a first synchronous motor is in transmission connection with a first transmission shaft through a first clutch; the hydraulic motor is in transmission connection with the first transmission shaft through a soil throwing speed reducer; the second synchronous motor is in transmission connection with the second transmission shaft through a second clutch; the second transmission shaft drives the gear pump to move, and the gear pump drives the lubricating cooling liquid to circularly flow among the driving reduction gearbox, the first clutch and the second clutch; the first transmission shaft and the second transmission shaft are in transmission connection with a drill rod of the rotary drilling rig through gears; the drill rod is driven by a hydraulic motor and / or a first synchronous motor and a second synchronous motor; the problems that a square electric driving power head is poor in soil throwing capacity and low in efficiency are solved, meanwhile, torque increasing is achieved, and the instantaneous rock breaking capacity is enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of rotary drilling rig driving, and in particular relates to a rotary drilling rig dual driving force system with a self-circulating cooling function. Background Art

[0002] The power head of the traditional rotary drilling rig is hydraulically driven, with low transmission efficiency and high energy consumption. As construction machinery products gradually develop towards the electric field, the rotary drilling rig breaks the traditional driving mode and its power head is driven by an electric motor, which can not only improve transmission efficiency but also reduce energy consumption and environmental pollution. However, a problem arises: the motor drive will produce large inertia and delay under the condition of soil throwing, resulting in poor soil throwing ability and low efficiency, which seriously affects the construction progress. This is a major bottleneck for the development of rotary drilling rigs towards the electric drive field and is not suitable for market promotion and application. Summary of the invention

[0003] The purpose of the present invention is to provide a dual driving force system for a rotary drilling rig with a self-circulating cooling function, which can solve the problems of poor soil throwing ability and low efficiency of a square electric driving force head, while achieving torque increase and enhancing instantaneous rock breaking ability.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: In the first aspect, the present invention provides a dual-drive force system for a rotary drilling rig with a self-circulating cooling function, comprising a first synchronous motor, a second synchronous motor, a driving reduction box and a hydraulic motor; the driving reduction box is provided with a first transmission shaft and a second transmission shaft; The first synchronous motor is connected to the first transmission shaft via a first clutch, and the first clutch can control the first synchronous motor to be disengaged from the first transmission shaft; the hydraulic motor is connected to the first transmission shaft via a soil-throwing reducer; The second synchronous motor is connected to the second transmission shaft via a second clutch, and the second clutch can control the second synchronous motor to be disengaged from the second transmission shaft; The second transmission shaft drives the gear pump to move, and the gear pump, the driving reduction box, the first clutch and the second clutch are connected through a cooling oil pipe; the gear pump drives the lubricating coolant to circulate between the driving reduction box, the first clutch and the second clutch; The first transmission shaft and the second transmission shaft are connected to the drill rod of the rotary drilling rig through gear transmission; the drill rod is driven by a hydraulic motor and / or a first synchronous motor and a second synchronous motor.

[0005] Further, the first clutch and the second clutch include a clutch input shaft, a connecting sleeve, a piston and a clutch housing; the clutch input shaft and the connecting sleeve are installed on the clutch housing through a bearing; the clutch input shaft is connected to the output shaft of the first synchronous motor or the output shaft of the second synchronous motor; the connecting sleeve is connected to the first transmission shaft or the second transmission shaft; A piston is slidably arranged in the clutch housing, and the sliding direction of the piston is arranged along the axial direction of the clutch input shaft; a friction plate is arranged on the piston; The end of the clutch input shaft is in the connecting sleeve, and a gap for accommodating a friction plate is provided between the clutch input shaft and the connecting sleeve; the hydraulic system drives the friction plate and the piston to move, and when the friction plate is embedded in the gap between the clutch input shaft and the connecting sleeve, the clutch input shaft and the connecting sleeve are in a transmission connection state; when the friction plate moves out of the gap between the clutch input shaft and the connecting sleeve, the clutch input shaft and the connecting sleeve are in a disengaged state.

[0006] Furthermore, a compression spring is provided at one end of the piston, and a control oil port is provided at the other end of the piston, and the control oil port is externally connected to a hydraulic control system; the compression spring drives the friction plate to embed into the gap between the clutch input shaft and the connecting sleeve; the hydraulic control system injects hydraulic oil into the clutch housing through the control oil port to push the friction plate to move out of the gap between the clutch input shaft and the connecting sleeve.

[0007] Furthermore, the clutch input shaft includes a first shaft section and a second shaft section; the first shaft section and the second shaft section are located in the connecting sleeve, the first shaft section and the connecting sleeve are rotatably connected via a bearing, and the gap is arranged between the second shaft section and the connecting sleeve.

[0008] Furthermore, the driving reduction box is configured with a first driving gear, a second driving gear and an operating gear, and the first driving gear and the operating gear, the second driving gear and the operating gear are meshed with each other; the first transmission shaft is connected to the first driving gear; the second transmission shaft is connected to the second driving gear; and the operating gear is connected to the drill pipe.

[0009] Furthermore, the first clutch and the second clutch are provided with a first cooling oil inlet U1, a second cooling oil inlet U2 and a cooling oil outlet U3; the oil inlet of the driving reduction box is connected to the gear pump through an oil circuit; the oil outlet of the gear pump is connected to the first cooling oil inlet U1 and the second cooling oil inlet U2 through an oil circuit; the cooling oil outlet U3 is connected to the driving reduction box through an oil circuit.

[0010] Furthermore, the cooling oil outlet U3 is lower in height than the first cooling oil inlet U1 and the second cooling oil inlet U2.

[0011] Furthermore, a one-way valve is arranged in the oil circuit between the driving reduction box and the gear pump; the conduction direction of the one-way valve is set from the driving reduction box to the gear pump; the two ports of the one-way valve are connected to a parallel filter in the oil circuit; and the filter is used to filter the lubricating coolant from the gear pump to the driving reduction box.

[0012] In a second aspect, the present invention provides a control method for a dual driving force system of a rotary drilling rig with a self-circulating cooling function, comprising: The rotary drilling rig is provided with a first working mode and a second working mode; When the rotary drilling rig is switched to the first working mode, the first synchronous motor and the second synchronous motor are controlled to move, the first synchronous motor drives the first transmission shaft to rotate through the first clutch; the second synchronous motor drives the second transmission shaft to rotate through the second clutch; the first transmission shaft and the first transmission shaft jointly drive the drill rod to rotate through gear transmission; the hydraulic oil port of the hydraulic motor is controlled to be closed, and the hydraulic motor and the soil-throwing reducer follow; When the rotary drilling rig switches to the second working mode, the first synchronous motor is disengaged from the first transmission shaft through the first clutch; the second synchronous motor is disengaged from the second transmission shaft through the second clutch; the first transmission shaft is driven to rotate by the hydraulic motor through the soil-throwing reducer, and the drill rod is driven to rotate by the first transmission shaft through gear transmission.

[0013] Furthermore, the rotary drilling rig is provided with a third working mode. When the rotary drilling rig is switched to the third working mode, the hydraulic motor, the first synchronous motor and the second synchronous motor are controlled to move. The first synchronous motor drives the first transmission shaft to rotate through the first clutch, and the hydraulic motor drives the first transmission shaft to rotate through the soil-throwing reducer; The second synchronous motor drives the second transmission shaft to rotate through the second clutch; the first transmission shaft and the first transmission shaft jointly drive the drill rod to rotate through gear transmission.

[0014] Furthermore, when the rotary drilling rig switches to the first working mode or the third working mode, the second synchronous motor drives the second transmission shaft to rotate through the second clutch; the second transmission shaft drives the gear pump; the gear pump drives the lubricating coolant to circulate between the drive reduction box, the first clutch and the second clutch.

[0015] Compared with the prior art, the present invention has the following beneficial effects: According to the present invention, the first synchronous motor is connected to the first transmission shaft through the first clutch, and the first clutch can control the first synchronous motor to disengage from the first transmission shaft; the hydraulic motor is connected to the first transmission shaft through the soil-throwing reducer; the second synchronous motor is connected to the second transmission shaft through the second clutch, and the second clutch can control the second synchronous motor to disengage from the second transmission shaft; the first transmission shaft and the second transmission shaft are connected to the drill rod of the rotary drilling rig through gear transmission; the drill rod is driven by the hydraulic motor and / or the first synchronous motor and the second synchronous motor; the present invention can switch between multiple driving modes to drive the drill rod, and can switch between different driving modes as needed to adapt to different working conditions and requirements; when the drill rod is driven by the hydraulic motor, the first synchronous motor and the second synchronous motor together, the instantaneous rock breaking ability can be enhanced.

[0016] The second transmission shaft of the present invention drives the gear pump to move, and the gear pump, driving reduction box, first clutch and second clutch are connected through a cooling oil pipe; the gear pump drives the lubricating coolant to circulate between the driving reduction box, the first clutch and the second clutch; the heat generated by these key components can be dissipated more effectively, thereby improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an axonometric diagram of the dual driving force system of the rotary drilling rig provided in the present embodiment 1; Figure 2 is a front view of the dual driving force system of the rotary drilling rig provided in the present embodiment 1; Figure 3 is a top view of the dual driving force system of the rotary drilling rig provided in the present embodiment 1; Figure 4 is a cross-sectional view at P provided in this embodiment 1; Figure 5 is a cross-sectional view of the dual driving force system of the rotary drilling rig provided in the first embodiment, taken along the AA direction; Figure 6 is a BB direction cross-sectional view of the dual driving force system of the rotary drilling rig provided in the present embodiment 1; Figure 7 This is a diagram of the cooling oil pipe connection provided in this embodiment 1.

[0018] In the figure, 11 is the first synchronous motor, 12 is the first cooling oil pipe, 13 is the first clutch, 14 is the second cooling oil pipe, 15 is the third cooling oil pipe, 16 is the soil-throwing reducer; 17 is the hydraulic motor, 19 is the fourth cooling oil pipe, 20 is the fifth cooling oil pipe, 21 is the driving reduction box, 211 is the first transmission shaft, 212 is the first driving gear, 213 is the working gear, 214 is the second transmission shaft, 215 is the second driving gear, 22 is the second synchronous motor, 23 is the second clutch, 24 is the sixth cooling oil pipe, 25 is the gear pump, 26 is the seventh cooling oil pipe, 27 is the eighth cooling oil pipe, 28 is the ninth cooling oil pipe, 29 is the bearing, 30 is the clutch object, 31 is the clutch input shaft, 32 is the piston, 33 is the connecting sleeve, 321 is the friction plate, and 322 is the compression spring. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0020] It should be noted that in the description of the present invention, the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. The terms "front", "rear", "left", "right", "up", and "down" used in the description of the present invention refer to the directions in the accompanying drawings, and the terms "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0021] Example 1

[0022] like Figures 1 to 7 As shown, this embodiment provides a dual-drive force system for a rotary drilling rig with a self-circulating cooling function, including a first synchronous motor 11, a second synchronous motor 22, a driving reduction box 21 and a hydraulic motor 17; the driving reduction box 21 is provided with a first transmission shaft 211, a second transmission shaft 214, a first driving gear 212, a second driving gear 215 and a working gear 213, the first driving gear 212 and the working gear 213, the second driving gear 215 and the working gear 213 are meshed with each other; the first transmission shaft 211 is connected to the first driving gear 212; the second transmission shaft 214 is connected to the second driving gear 215; the working gear 213 is connected to the drill pipe.

[0023] The first synchronous motor 11 is connected to the first transmission shaft 211 through the first clutch 13, and the first clutch 13 can control the first synchronous motor 11 to disengage from the first transmission shaft 211; the hydraulic motor 17 is connected to the first transmission shaft 211 through the soil-throwing reducer 16; the second synchronous motor 22 is connected to the second transmission shaft 214 through the second clutch 23, and the second clutch 23 can control the second synchronous motor 22 to disengage from the second transmission shaft 214; the first transmission shaft 211 and the second transmission shaft 214 are connected to the drill rod of the rotary drilling rig through gear transmission; the drill rod is driven by the hydraulic motor 17 and / or the first synchronous motor 11 and the second synchronous motor 22.

[0024] In this embodiment, the first clutch 13 and the second clutch 23 include a clutch input shaft 31, a connecting sleeve 33 and a clutch housing 30; the clutch input shaft 31 and the connecting sleeve are installed on the clutch housing 30 through bearings; the clutch input shaft 31 is connected to the output shaft of the first synchronous motor 11 or the output shaft of the second synchronous motor 22; the connecting sleeve 33 is connected to the first transmission shaft 211 or the second transmission shaft 214; A piston 32 is slidably disposed in the clutch housing 30, and the sliding direction of the piston 32 is arranged along the axial direction of the clutch input shaft 31; a friction plate 321 is arranged on the piston 32; The end of the clutch input shaft 31 is located in the connecting sleeve 33, and a gap for accommodating the friction plate 321 is provided between the clutch input shaft 31 and the connecting sleeve 33; the hydraulic system drives the friction plate 321 and the piston 32 to move, and when the friction plate 321 is embedded in the gap between the clutch input shaft 31 and the connecting sleeve 33, the clutch input shaft 31 and the connecting sleeve 33 are in a transmission connection state; when the friction plate 321 moves out of the gap between the clutch input shaft 31 and the connecting sleeve 33, the clutch input shaft 31 and the connecting sleeve 33 are in a disengaged state.

[0025] A compression spring 322 is provided at one end of the piston 32, and a control oil port S is provided at the other end of the piston 32, and the control oil port S is externally connected to a hydraulic control system; the compression spring 322 drives the friction plate 321 to embed into the gap between the clutch input shaft 31 and the connecting sleeve 33; the hydraulic control system injects hydraulic oil into the clutch housing 30 through the control oil port, pushing the friction plate 321 to move out of the gap between the clutch input shaft 31 and the connecting sleeve.

[0026] The clutch input shaft 31 includes a first shaft section and a second shaft section; the first shaft section and the second shaft section are located in the connecting sleeve 33, the first shaft section and the connecting sleeve 33 are rotatably connected via a bearing 29, and the gap is set between the second shaft section and the connecting sleeve 33.

[0027] The second transmission shaft 214 drives the gear pump 25 to move, and the gear pump 25, the driving reduction box 21, the first clutch 13 and the second clutch 23 are connected through a cooling oil pipe; the first clutch 13 and the second clutch 23 are equipped with a first cooling oil inlet U1, a second cooling oil inlet U2 and a cooling oil outlet U3; the driving reduction box 21 is connected to the oil inlet B1 of the gear pump 25 through an oil circuit; the oil outlet B2 of the gear pump 25 is connected to the first cooling oil inlet U1 and the second cooling oil inlet U2 through an oil circuit; the cooling oil outlet U3 is connected to the driving reduction box 21 through an oil circuit. The height of the cooling oil outlet U3 is lower than the first cooling oil inlet U1 and the second cooling oil inlet U2; the gear pump 25 drives the lubricating coolant to circulate between the driving reduction box 21, the first clutch 13 and the second clutch 23.

[0028] In this embodiment, the driving reduction box 21 is connected to the oil inlet B1 of the gear pump 25 through the fifth cooling oil pipe 20; the oil outlet B2 of the gear pump 25 is connected to the diverter through the fourth cooling oil pipe 19; the diverter is connected to the first cooling oil inlet U1 of the first clutch 13 through the first cooling oil pipe 12; the diverter is connected to the second cooling oil inlet U2 of the first clutch 13 through the second cooling oil pipe 14; the diverter is connected to the first cooling oil inlet U1 of the second clutch 23 through the eighth cooling oil pipe 27; the diverter is connected to the second cooling oil inlet U2 of the second clutch 23 through the ninth cooling oil pipe 28; the cooling oil outlet U3 of the first clutch 13 is connected to the driving reduction box 21 through the third cooling oil pipe 15; the cooling oil outlet U3 of the second clutch 23 is connected to the driving reduction box 21 through the seventh cooling oil pipe 26; A one-way valve is arranged on the oil circuit between the driving reduction box 21 and the gear pump 25; the conducting direction of the one-way valve is arranged from the driving reduction box to the gear pump; the two ports of the one-way valve are connected to a filter in parallel through the oil circuit; the filter is used to filter the lubricating coolant from the gear pump 25 to the driving reduction box 21.

[0029] Example 2

[0030] This embodiment provides a control method for a dual driving force system of a rotary drilling rig with a self-circulating cooling function. The control method is applied to the dual driving force system of a rotary drilling rig described in Example 1. The control method includes: The rotary drilling rig is provided with a first working mode, a second working mode and a third working mode; When the rotary drilling rig is switched to the first working mode, the control oil port S is in a closed state, the compression spring 322 drives the friction plate 321 to be embedded in the gap between the clutch input shaft 31 and the connecting sleeve 33, and the first synchronous motor 11 and the first transmission shaft 211, and the second synchronous motor 22 and the first transmission shaft 211 are in a transmission connection state; The movement of the first synchronous motor 11 and the second synchronous motor 22 is controlled. The first synchronous motor 11 drives the first transmission shaft 211 to rotate through the first clutch 13; the second synchronous motor 22 drives the second transmission shaft 214 to rotate through the second clutch 23; the first transmission shaft 211 and the first transmission shaft 214 jointly drive the drill pipe to rotate through gear transmission; the hydraulic oil port of the hydraulic motor 17 is controlled to be closed, and the hydraulic motor 17 and the soil-throwing reducer 16 follow.

[0031] When the rotary drilling rig switches to the second working mode, the control oil port S is in an open state, and the hydraulic control system injects hydraulic oil into the clutch housing 30 through the control oil port to push the friction plate 321 to move out of the gap between the clutch input shaft 31 and the connecting sleeve. The first synchronous motor 11 and the first transmission shaft 211, and the second synchronous motor 22 and the first transmission shaft 211 are in a disengaged state, that is: the first synchronous motor 11 is controlled to be disengaged from the first transmission shaft 211 by the first clutch 13; the second synchronous motor 22 and the second transmission shaft 214 are controlled to be disengaged by the second clutch 23; the first transmission shaft 211 is driven to rotate by the hydraulic motor 17 through the soil-throwing reducer 16, and the first transmission shaft 211 drives the drill rod to rotate together through gear transmission.

[0032] When the rotary drilling rig is switched to the third working mode, the control oil port S is in a closed state, the compression spring 322 drives the friction plate 321 to be embedded in the gap between the clutch input shaft 31 and the connecting sleeve 33, and the first synchronous motor 11 and the first transmission shaft 211, and the second synchronous motor 22 and the first transmission shaft 211 are in a transmission connection state; Control the movement of the hydraulic motor 16, the first synchronous motor 11 and the second synchronous motor 22, the first synchronous motor 11 drives the first transmission shaft 211 to rotate through the first clutch 13, and at the same time, the hydraulic motor 17 drives the first transmission shaft 211 to rotate through the soil-throwing reducer 16; The second synchronous motor 22 drives the second transmission shaft 214 to rotate through the second clutch 23; the first transmission shaft 211 and the first transmission shaft 214 jointly drive the drill rod to rotate through gear transmission.

[0033] The present invention can switch between multiple driving modes to drive the drill rod, and can switch between different driving modes as needed to adapt to different working conditions and requirements; when the drill rod is driven by the hydraulic motor, the first synchronous motor and the second synchronous motor together, the instantaneous rock breaking capability can be enhanced.

[0034] When the rotary drilling rig switches to the first working mode or the third working mode, the second synchronous motor 22 drives the second transmission shaft 214 to rotate through the second clutch 23; the second transmission shaft 214 drives the gear pump 25; the gear pump 25 drives the lubricating coolant to circulate between the driving reduction box 21, the first clutch 13 and the second clutch 23; the heat generated by these key components can be dissipated more effectively, thereby improving the cooling efficiency.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A dual driving force system for a rotary drilling rig with a self-circulating cooling function, characterized in that: It includes a first synchronous motor, a second synchronous motor, a driving reduction box and a hydraulic motor; the driving reduction box is provided with a first transmission shaft and a second transmission shaft; The first synchronous motor is connected to the first transmission shaft via a first clutch, and the first clutch can control the first synchronous motor to be disengaged from the first transmission shaft; the hydraulic motor is connected to the first transmission shaft via a soil-throwing reducer; The second synchronous motor is connected to the second transmission shaft via a second clutch, and the second clutch can control the second synchronous motor to be disengaged from the second transmission shaft; The second transmission shaft drives the gear pump to move, and the gear pump, the driving reduction box, the first clutch and the second clutch are connected through a cooling oil pipe; the gear pump drives the lubricating coolant to circulate between the driving reduction box, the first clutch and the second clutch; The first transmission shaft and the second transmission shaft are connected to the drill rod of the rotary drilling rig through gear transmission; the drill rod is driven by a hydraulic motor and / or a first synchronous motor and a second synchronous motor.

2. The dual driving force system of the rotary drilling rig according to claim 1 is characterized in that: The first clutch and the second clutch comprise a clutch input shaft, a connecting sleeve, a piston and a clutch housing; the clutch input shaft and the connecting sleeve are mounted on the clutch housing through bearings; the clutch input shaft is connected to the output shaft of the first synchronous motor or the output shaft of the second synchronous motor; the connecting sleeve is connected to the first transmission shaft or the second transmission shaft; A piston is slidably arranged in the clutch housing, and the sliding direction of the piston is arranged along the axial direction of the clutch input shaft; a friction plate is arranged on the piston; The end of the clutch input shaft is located in the connecting sleeve, and a gap for accommodating the friction plate is provided between the clutch input shaft and the connecting sleeve; The hydraulic system drives the friction plate and the piston to move. When the friction plate is embedded in the gap between the clutch input shaft and the connecting sleeve, the clutch input shaft and the connecting sleeve are in a transmission connection state; when the friction plate moves out of the gap between the clutch input shaft and the connecting sleeve, the clutch input shaft and the connecting sleeve are in a disengaged state.

3. The dual driving force system of the rotary drilling rig according to claim 2 is characterized in that: A compression spring is provided at one end of the piston, and a control oil port is provided at the other end of the piston, and the control oil port is externally connected to a hydraulic control system; the compression spring drives the friction plate to embed into the gap between the clutch input shaft and the connecting sleeve; the hydraulic control system injects hydraulic oil into the clutch housing through the control oil port to push the friction plate to move out of the gap between the clutch input shaft and the connecting sleeve.

4. The dual driving force system of the rotary drilling rig according to claim 2, characterized in that: The clutch input shaft comprises a first shaft section and a second shaft section; the first shaft section and the second shaft section are located in the connecting sleeve, the first shaft section and the connecting sleeve are rotatably connected via a bearing, and the gap is arranged between the second shaft section and the connecting sleeve.

5. The dual driving force system of the rotary drilling rig according to claim 1, characterized in that: The driving reduction box is provided with a first driving gear, a second driving gear and a working gear, the first driving gear and the working gear, the second driving gear and the working gear are meshed with each other; the first transmission shaft is connected to the first driving gear; The second transmission shaft is connected to the second driving gear; and the operating gear is connected to the drill rod.

6. The dual driving force system of the rotary drilling rig according to claim 1, characterized in that: The first clutch and the second clutch are provided with a first cooling oil inlet U1, a second cooling oil inlet U2 and a cooling oil outlet U3; the oil inlet of the driving reduction box is connected with the gear pump through an oil circuit; the oil outlet of the gear pump is connected with the first cooling oil inlet U1 and the second cooling oil inlet U2 through an oil circuit; the cooling oil outlet U3 is connected with the driving reduction box through an oil circuit.

7. The dual driving force system of the rotary drilling rig according to claim 6, characterized in that: A one-way valve is arranged on the oil circuit between the driving reduction box and the gear pump; the conducting direction of the one-way valve is arranged from the driving reduction box to the gear pump; the two ports of the one-way valve are connected to a filter in parallel through the oil circuit; the filter is used to filter the lubricating coolant from the gear pump to the driving reduction box.

8. The control method of the dual driving force system of a rotary drilling rig according to any one of claims 1 to 7, comprising: The rotary drilling rig is provided with a first working mode and a second working mode; When the rotary drilling rig is switched to the first working mode, the first synchronous motor and the second synchronous motor are controlled to move, and the first synchronous motor drives the first transmission shaft to rotate through the first clutch; The second synchronous motor drives the second transmission shaft to rotate through the second clutch; the first transmission shaft and the first transmission shaft jointly drive the drill rod to rotate through gear transmission; the hydraulic oil port of the hydraulic motor is controlled to be closed, and the hydraulic motor and the soil-throwing reducer follow; When the rotary drilling rig switches to the second working mode, the first synchronous motor is disengaged from the first transmission shaft through the first clutch; the second synchronous motor is disengaged from the second transmission shaft through the second clutch; the first transmission shaft is driven to rotate by the hydraulic motor through the soil-throwing reducer, and the drill rod is driven to rotate by the first transmission shaft through gear transmission.

9. The control method according to claim 8, characterized in that: Also includes: The rotary drilling rig is provided with a third working mode. When the rotary drilling rig is switched to the third working mode, the hydraulic motor, the first synchronous motor and the second synchronous motor are controlled to move. The first synchronous motor drives the first transmission shaft to rotate through the first clutch, and the hydraulic motor drives the first transmission shaft to rotate through the soil-throwing reducer; The second synchronous motor drives the second transmission shaft to rotate through the second clutch; the first transmission shaft and the first transmission shaft jointly drive the drill rod to rotate through gear transmission.

10. The control method according to claim 9, characterized in that: Also includes: When the rotary drilling rig is switched to the first working mode or the third working mode, the second synchronous motor drives the second transmission shaft to rotate through the second clutch; The second transmission shaft drives the gear pump; The gear pump drives the lubricating coolant to circulate among the driving reduction box, the first clutch and the second clutch.

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