Built-in chuck type double-motor electric driving power head and implementation method thereof

Abstract

The invention discloses a built-in chuck type double-motor electric driving power head and an implementation method thereof. The built-in chuck type double-motor electric driving power head comprises two sets of motors, chucks and a main shaft, wherein the chucks and the main shaft are arranged in a shell; a small rotation gear, a motor bevel gear, a middle bevel gear, a connecting rod and a supporting ring are arranged between the two motors to form a differential mechanism, steering of the two motors is controlled to clamp a drill rod and drive drilling, and torque can be synchronously output by the two motors without keeping the same rotating speed through reverse application of the differential mechanism principle. And the overall efficiency under the condition of multiple motors is effectively improved. From the rotation action to the clamping action, a traditional hydraulic power source which is prone to oil leakage and high in fault rate is abandoned, the motor with the low-speed and large-torque characteristics is adopted, rotation efficiency is higher, torque is larger, a rod can be additionally arranged on the rear portion, a chuck and the gyrator are integrated, internal action and external static are achieved, the structure is simpler, and cost is lower. And the safety and the reliability are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine drilling equipment, and relates to a built-in chuck type dual-motor electric driving force head and a realization method thereof. Background Art

[0002] In recent years, the conventional rotary drilling method has been mainly used in underground drilling construction in coal mines. The drilling rig is the main equipment for drilling construction. The power head is the key component of the drilling rig and is connected to the drilling rig feed device. It is mainly used to clamp the drill rod and provide the torque required to drive the drill rod in the hole to achieve drilling of the drill rod drill bit. There are two types of rotators: through-hole and non-through-hole, corresponding to the two structural forms of chuck and active drill rod. The through-hole rotator allows the drill rod to pass through the main shaft, and a rod can be added at the rear and a longer drill rod can be used, which has a wide range of uses; the non-through-hole rotator has a water pump that is connected to the main shaft as a whole, and the drill rod does not need to be unscrewed to connect the water pump, but only a rod can be added in the middle and a drill rod with a length less than the feed stroke must be used, which has a low drilling efficiency.

[0003] At present, the equipment put into use on site is basically hydraulic drilling rigs driven by hydraulic systems, and their power heads are driven by hydraulic motors. This form cannot avoid the shortcomings of oil leakage, poor control accuracy, and inability to monitor the operating status. Therefore, with the emergence and popularization of electric drilling rigs, there is an urgent need for an electric driving power head with high torque, motor drive, rear rod, simple structure and easy maintenance. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a built-in chuck-type dual-motor electric drive power head and its implementation method, so as to solve the problems of developing supporting high-torque power heads for electric-driven drilling rigs and solving the problems of insufficient control accuracy of hydraulic power heads.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0006] A built-in chuck type dual-motor electric driving force head, comprising a motor I, a motor II, a chuck and a spindle arranged in a housing;

[0007] The motor I and the motor II are fixed on the housing opposite to each other, and a rotating pinion that can rotate around the axis is sleeved on the motor shaft of the motor II; a supporting ring that can rotate around the axis is sleeved on the motor shaft of the motor I, and a transmission gear is also fixed on the motor shaft of the motor I; the two motor shafts are coaxially opposite to each other and both ends are provided with motor bevel gears; the supporting ring and the rotating pinion are welded and hard-connected to each other through a differential connecting plate, and a hole is opened on the differential connecting plate to place the middle shaft, and the middle shaft is located between the two motor bevel gears, and two middle shaft bevel gears are fixedly sleeved on the middle shaft, and the two middle shaft bevel gears are located between the two motor bevel gears and mesh with each other, and the two motors and the motor bevel gears can drive the middle shaft and the middle shaft bevel gears to rotate around their own axes or revolve around the axes of the motor shafts;

[0008] The chuck comprises a chuck body, a chuck piston and a slip; the chuck body is cylindrical, and teeth are arranged on the outer wall of the rear part of the chuck body; the transmission gear on the motor shaft of the motor I is connected to the teeth on the outer wall of the chuck body through a transmission belt; the inner wall of the chuck body is provided with an internal thread to match the outer thread of the outer wall of the inner chuck piston; the inner wall of the chuck piston is provided with a plurality of inclined grooves to place slips; the transmission gear drives the chuck body to rotate and drives the chuck piston to move axially so that the slips can clamp the drill pipe;

[0009] The main shaft is outer-mounted and meshed with a rotating large gear, and the rotating large gear is connected and meshed with a rotating small gear through a conversion gear; a plurality of axial extension columns are welded to the front end of the main shaft, and the extension columns can pass through the axial through grooves on the inner wall of the chuck piston.

[0010] The present invention also includes the following technical features:

[0011] Specifically, the motor shaft of motor II is longer than the motor shaft of motor I; the rotating pinion is connected to the motor shaft of motor II through a support bearing so as to be able to make circular motion around the axis; the support ring is connected to the motor shaft of motor I through a load-bearing bearing so as to be able to make circular motion around the axis.

[0012] Specifically, a bearing is provided between the middle shaft and the hole of the differential connecting plate; and the axis of the middle shaft intersects the axis of the motor shaft perpendicularly.

[0013] Specifically, a chuck support bearing is provided between the chuck body and the inner wall of the shell; a chuck front end thrust bearing is provided between the chuck and the front end cover of the shell so that the chuck body of the chuck can rotate inside the shell.

[0014] Specifically, the slips are inclined slips, the outer wall inclined surface of the slips matches the inclined surface groove of the inner wall of the chuck piston; the slips are supported by slip springs.

[0015] Specifically, the front end of the extension column is also equipped with a bolt-connected cava retaining ring to press the cava to prevent its axial movement; a piston front end thrust bearing is provided between the cava retaining ring and the front end cover of the shell to limit the axial movement of the main shaft and internal components of the chuck.

[0016] Specifically, a main shaft tail end support bearing is provided between the main shaft and the inner wall of the shell.

[0017] Specifically, a chuck rear end thrust bearing and a large gear rear end thrust bearing are arranged on the front and rear sides of the rotating large gear to offset the axial force on the main shaft and the chuck in the working state.

[0018] Specifically, the conversion gear is sleeved on a conversion shaft, and the conversion shaft is fixed between motor I and motor II and is parallel to the motor shafts.

[0019] The method for clamping and driving a drill rod by using a built-in chuck type dual-motor electric drive power head comprises the following steps:

[0020] When the motor I is started, the transmission gear fixed to it is driven by its motor shaft, and the transmission belt meshing with it is driven at the same time, and the transmission belt drives the chuck body to rotate around the center line of the main shaft; at this time, the motor II is started at the same time, and the speed is kept the same as that of the motor I, and the two motor shafts rotate in opposite directions. The two motor bevel teeth are meshed with the bevel teeth of the middle shaft, and the bevel teeth of the middle shaft only produce self-rotation but not revolution. The middle shaft, support ring, differential connecting plate, and rotating pinion remain stationary and will not drive the main shaft to rotate; at this time, the chuck piston and the inclined surface slips and the main shaft inside the chuck remain stationary to form a speed difference with the chuck body, and the upper thread buckle of the chuck piston is completed, so that the chuck piston produces an axial displacement in the direction of the front end cover of the shell; the inclined surface slips produce radial displacement under the extrusion of the inclined surface groove of the chuck piston to clamp the drill pipe; when the drill pipe needs to be loosened, the buckle can be removed by reversing the motor I and motor II according to the above steps;

[0021] After the drill rod is clamped, the two motor shafts of motor I and motor II rotate in the same direction at the same time. Since motor I and motor II are placed opposite each other, the central shaft bevel gear revolves under the drive of the motor bevel gears at both ends, driving the central shaft, differential connecting plate, support ring, and rotating pinion to rotate; the chuck body and the main shaft rotate in the same direction after being driven by the transmission belt and the conversion gear respectively. At this time, the rotator is in the state of clamping the drill rod and rotating normally to complete the drilling action.

[0022] Compared with the prior art, the present invention has the following technical effects:

[0023] From the rotation action to the clamping action, the present invention completely abandons the traditional hydraulic power source that is prone to oil leakage and has a high failure rate, and adopts a motor with low-speed and high-torque characteristics, which has higher rotation efficiency and greater torque. It can add a rod at the rear and integrate the chuck and the rotator into one body, realizing internal action and external stillness, and has a simpler structure, thereby improving safety and reliability.

[0024] The present invention can increase the torque of the power head by using dual motors, and significantly improve the precise control and monitoring of the rotation speed, torque and clamping state.

[0025] The power synthesis device designed in the present invention is a differential composed of a small rotary gear, motor bevel gears, intermediate bevel gears, a connecting rod and a supporting ring between the two motors. The differential principle is applied in reverse to achieve the simultaneous and synchronous output of torque by the two motors without maintaining the same rotation speed, thereby effectively improving the overall efficiency in the case of multiple motors.

[0026] The all-electric driving power head of the present invention can be better connected to the electric control system of the electric drilling rig, thereby reducing the overall complexity of the electric drilling rig system.

[0027] The integrated chuck of the present invention does not need a traditional rubber cartridge, has better durability, and can realize the clamping and rotation of drill rods of various specifications and sizes by simply replacing the slips.

[0028] The integrated sealing design of the present invention eliminates structures such as oil pipe joints and chuck spindle connection gaps on the power head housing, effectively reducing the ingress of debris and coal dust during use of the drilling rig in the harsh environment of underground coal mines, thereby improving the fault tolerance rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is the general assembly drawing of the electric drive power head.

[0030] Figure 2 This is a diagram of the internal structure of the electric drive head.

[0031] Figure 3 This is the overall cross-sectional view of the electric drive head.

[0032] Figure 4 This is a cross-sectional view of the motor power synthesis structure.

[0033] Figure 5 This is a cross-sectional view of the chuck structure.

[0034] Figure 6 The main axis structure diagram.

[0035] Figure 7 This is a cross-sectional view of the chuck piston.

[0036] Figure 8 A cross-sectional view of the chuck body.

[0037] Fig. 9 For Kavatu.

[0038] The meaning of each number in the figure is:

[0039] 1. Motor I, 2. Motor II, 3. Front end cover, 4. Housing, 5. Drive belt, 6. Spindle, 7. Spindle tail end support bearing, 8. Rotating large gear, 9. Chuck support bearing, 10. Chuck front end thrust bearing, 11. Chuck, 12. Motor shaft, 13. Conversion gear, 14. Conversion shaft, 15. Large gear rear end thrust bearing, 16. Chuck rear end thrust bearing, 17. Chuck body, 18. Chuck piston, 19. Cava, 20. Piston front end thrust bearing, 21. Cava retaining ring, 22. Load bearing, 23. Support ring, 24. Middle shaft, 25. Bearing, 26. Differential connecting plate, 27. Rotating small gear, 28. Support bearing, 29. Drive gear, 30. Motor bevel gear, 31. Middle shaft bevel gear, 32. Extension column, 33. Cava spring. DETAILED DESCRIPTION

[0040] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0041] Embodiment 1:

[0042] like Figures 1 to 9 As shown, this embodiment provides a built-in chuck type dual-motor electric driving power head, including motor I1, motor II2 and a chuck 11 and a spindle 6 arranged in a shell 4; wherein the power input part is a dual motor arranged on the top of the power head; the power transmission part is the motor shaft-transmission gear-transmission belt-chuck body of motor I, and the motor shaft-rotating small gear-conversion gear-rotating large gear of motor II; the power output part is the rotating large gear meshing with the conversion gear, and at the same time, the teeth of the central part are meshed with the spindle to provide a rotating torque; the clamping power output part is the chuck body-chuck piston-spindle-bevel cava of the chuck.

[0043] The motor I1 and the motor II2 are fixed on the housing 4, and the motor shaft 12 of the motor II2 is sleeved with a rotating pinion 27 that can rotate around the axis; the motor shaft 12 of the motor I1 is sleeved with a support ring 23 that can rotate around the axis, and a transmission gear 29 is also fixed on the motor shaft 12 of the motor I1; the two motor shafts 12 are coaxially opposite and both ends are provided with motor bevel gears 30; the support ring 23 and the rotating pinion 27 are welded and hard-connected to each other through a differential connecting plate 26, and a hole is opened in the middle of the differential connecting plate 26 to place the middle shaft 24, the middle shaft 24 is located between the two motor bevel gears 30, and two middle shaft bevel gears 31 are fixedly sleeved on the middle shaft 24. The two middle shaft bevel gears 31 are located between the two motor bevel gears 30 and mesh with each other. Specifically, the upper middle shaft bevel gear 31 meshes vertically with the two motor bevel gears 30 on both sides thereof, and the lower middle shaft bevel gear 31 meshes vertically with the two motor bevel gears 30 on both sides thereof. The two motors and the motor bevel gears 30 can drive the middle shaft 24 and the middle shaft bevel gear 31 to rotate around their own axes or revolve around the axis of the motor shaft 12.

[0044] The chuck includes a chuck body 17, a chuck piston 18 and a slip 19; the chuck body 17 is cylindrical, and teeth are provided on the outer wall of the rear end of the chuck body 17. The transmission gear 29 on the motor shaft 12 of the motor I1 is connected to the teeth on the outer wall of the chuck body 17 through a transmission belt 5; the inner wall of the chuck body 17 is provided with an internal thread to match the external thread on the outer wall of the chuck piston 18 therein; the inner wall of the chuck piston 18 is provided with a plurality of inclined grooves to place the slips 19; the transmission gear 29 drives the chuck body 17 to rotate and drives the chuck piston 18 to move axially so that the slips 19 can clamp the drill pipe.

[0045] The main shaft 6 is provided with an outer sleeve and meshes with a rotating large gear 8, and the rotating large gear 8 is connected to mesh with a rotating small gear 27 through a conversion gear 13; a plurality of axial extension columns 32 are welded to the front end of the main shaft 6, and the extension columns 32 can pass through the axial through-groove square groove on the inner wall of the chuck piston 18.

[0046] The motor shaft 12 of motor II2 is longer than the motor shaft 12 of motor I1; the rotating pinion 27 is connected to the motor shaft 12 of motor II2 through the support bearing 28 so as to be able to make circular motion around the axis; the support ring 23 is connected to the motor shaft 12 of motor I1 through the load-bearing bearing 22 so as to be able to make circular motion around the axis.

[0047] A bearing 25 is provided between the middle shaft 24 and the hole of the differential connecting plate 26; specifically, the two differential connecting plates 26 are arranged symmetrically up and down, and the two ends of the middle shaft 24 are respectively installed in the holes of the two differential connecting plates 26 through bearings; the axis of the middle shaft 24 intersects the axis of the motor shaft 12 perpendicularly.

[0048] A chuck support bearing 9 is provided between the chuck body 17 and the inner wall of the housing 4 ; a chuck front end thrust bearing 10 is provided between the chuck and the front end cover 3 of the housing 4 so that the chuck body 17 of the chuck can rotate inside the housing 4 .

[0049] The slips 19 are inclined slips 19 , and the outer wall inclined surface of the slips 19 matches with the inclined groove of the inner wall of the chuck piston 18 ; the slips 19 are mutually supported by slip springs 33 .

[0050] The front end of the extension column 32 is also equipped with a bolted cava retaining ring 21 to press the cava 19 to prevent its axial movement; a piston front end thrust bearing 20 is provided between the cava retaining ring 21 and the front end cover 3 of the housing 4 to limit the axial movement of the main shaft 6 and the internal components of the chuck.

[0051] A main shaft tail end support bearing 7 is provided between the main shaft 6 and the inner wall of the housing 4 .

[0052] A chuck rear end thrust bearing 16 and a gear rear end thrust bearing 15 are arranged on the front and rear sides of the rotating gear 8 to offset the axial force on the main shaft 6 and the chuck in the working state.

[0053] The conversion gear 13 is sleeved on the conversion shaft 14 . The conversion shaft 14 is fixed between the motor I1 and the motor II2 and is parallel to the motor shaft 12 .

[0054] This embodiment is applicable to drill rods of different diameters, but in order to ensure clamping reliability during use, slips of different specifications need to be replaced.

[0055] Embodiment 2:

[0056] This embodiment provides a method for clamping and driving a drill rod by a built-in chuck type dual-motor electric drive power head according to Embodiment 1, comprising the following steps:

[0057] When the motor I is started, it drives the transmission gear fixed to it through its motor shaft, and drives the transmission belt meshing with it at the same time. The transmission belt drives the chuck body to rotate around the center line of the main shaft; at this time, the motor II is started at the same time, and the speed remains the same as that of the motor I. The two motor shafts rotate in opposite directions, and the two motor bevel teeth mesh with the bevel teeth of the middle shaft. The bevel teeth of the middle shaft only produce self-rotation but not revolution. The power synthesis device composed of the middle shaft, support ring, differential connecting plate and rotating pinion remains stationary and will not drive the main shaft to rotate; at this time, the chuck inside the chuck The piston, the inclined surface slip and the main shaft remain stationary to form a speed difference with the chuck body, completing the upper thread buckle of the chuck piston, so that the chuck piston produces an axial displacement toward the front end cover of the housing; due to the restrictions of the slip retaining ring and the thrust bearing at the front end of the piston, the inclined surface slip can only produce radial displacement under the extrusion of the inclined surface groove of the chuck piston to clamp the drill pipe; motor I and motor II stop rotating synchronously, and the drill pipe can be kept clamped due to the self-locking mechanism of the thread buckle; when the drill pipe needs to be loosened, reverse motor I and motor II according to the above steps to remove the buckle;

[0058] After the drill rod is clamped, the two motor shafts of motor I and motor II rotate in the same direction at the same time. Since motor I and motor II are placed opposite each other, the central shaft bevel gear revolves under the drive of the motor bevel gears at both ends, driving the central shaft, differential connecting plate, support ring, and rotating pinion to rotate; the chuck body and the main shaft rotate in the same direction after being driven by the transmission belt and the conversion gear respectively. The main shaft speed must not exceed the chuck body speed and must keep rotating at the same speed. At this time, the rotator is in the state of clamping the drill rod and rotating normally to complete the drilling action.

[0059] In the present invention, the rotational speed coordination and gear ratio of the two motors need to be controlled.

[0060] When clamping the drill pipe, it is necessary to maintain the revolution speed M of the center shaft bevel gear. 公 is zero, the two motor shafts rotate in opposite directions relative to the entire device, and the rotation state of motor I is +M a1 Motor II rotation state is -M b1 , the rotation state refers to the speed and direction, (because the two motors are placed top to top, the directions of the two motors themselves are the same at this time);

[0061] M 公 =+M a1 +(-M b1 )=0

[0062] M a1 =M b1

[0063] During the clamping action and the loosening action, the two motor shafts rotate in opposite directions relative to the entire device, that is, the two motors themselves rotate in the same direction and have the same rotation speed.

[0064] In the case of drilling, the two motor shafts need to keep the same direction, and the rotation state of motor I is +M a2 Motor II rotation state is +M b2 The rotation state refers to the speed and direction (because the two motors are placed opposite to each other, the directions of the two motors are opposite at this time). It is necessary to ensure that the spindle speed M 主轴 With the chuck body speed M 卡盘体 same;

[0065] M 主轴 =M 卡盘体

[0066]

[0067] If the spindle speed Mspindle and the chuck body speed Mchuck body need to keep the same speed, then the relationship between the two motor speeds is:

[0068]

[0069] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0070] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0071] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A built-in chuck type dual-motor electric drive power head, characterized in that: It comprises a motor I (1), a motor II (2), a chuck (11) and a spindle (6) arranged in a housing (4); The motor I (1) and the motor II (2) are fixed on the housing (4) in a top-to-top manner; the motor shaft (12) of the motor II (2) is sleeved with a rotating pinion (27) that can rotate around the shaft; the motor shaft (12) of the motor I (1) is sleeved with a supporting ring (23) that can rotate around the shaft; the motor shaft (12) of the motor I (1) is also fixed with a transmission gear (29); the two motor shafts (12) are coaxially opposed and both ends are provided with motor bevel gears (30); the support ring (23) and the rotating pinion (27) are connected to each other. The two motors (12) are welded and rigidly connected to each other through a differential connection plate (26), the differential connection plate (26) is provided with a hole for accommodating a central shaft (24), the central shaft (24) is located between the two motor bevel teeth (30), two central shaft bevel teeth (31) are fixedly sleeved on the central shaft (24), the two central shaft bevel teeth (31) are located between the two motor bevel teeth (30) and mesh with each other, and the two motors and the motor bevel teeth (30) can drive the central shaft (24) and the central shaft bevel teeth (31) to rotate around their own axes or revolve around the axis of the motor shaft (12); The chuck (11) comprises a chuck body (17), a chuck piston (18) and a slip (19); the chuck body (17) is cylindrical, and teeth are arranged on the outer wall of the rear end of the chuck body (17); a transmission gear (29) on the motor shaft (12) of the motor I (1) is connected to the teeth on the outer wall of the chuck body (17) via a transmission belt (5); an inner thread is arranged on the inner wall of the chuck body (17) to match the outer thread of the outer wall of the chuck piston (18); a plurality of inclined grooves are arranged on the inner wall of the chuck piston (18) to accommodate the slip (19); the transmission gear (29) drives the chuck body (17) to rotate and drive the chuck piston (18) to move axially so that the slip (19) can clamp the drill pipe; The main shaft (6) is provided with an outer surface thereof and meshes with a rotating large gear (8), and the rotating large gear (8) is connected to mesh with a rotating small gear (27) via a conversion gear (13); a plurality of axial extension columns (32) are welded to the front end of the main shaft (6), and the extension columns (32) can pass through the axial through grooves on the inner wall of the chuck piston (18).

2. The built-in chuck type dual-motor electric driving force head according to claim 1, characterized in that: The motor shaft (12) of the motor II (2) is longer than the motor shaft (12) of the motor I (1); the rotating pinion (27) is connected to the motor shaft (12) of the motor II (2) via a supporting bearing (28) so as to be able to perform circular motion around the shaft; the supporting ring (23) is connected to the motor shaft (12) of the motor I (1) via a load-bearing bearing (22) so as to be able to perform circular motion around the shaft.

3. The built-in chuck type dual-motor electric driving force head according to claim 1, characterized in that: A bearing (25) is provided between the middle shaft (24) and the hole of the differential connection plate (26); the axis of the middle shaft (24) intersects perpendicularly with the axis of the motor shaft (12).

4. The built-in chuck type dual-motor electric driving force head according to claim 1, characterized in that: A chuck support bearing (9) is provided between the chuck body (17) and the inner wall of the housing (4); a chuck front end thrust bearing (10) is provided between the chuck (11) and the front end cover (3) of the housing (4) so ​​that the chuck body (17) of the chuck (11) can rotate inside the housing (4).

5. The built-in chuck type dual-motor electric driving force head according to claim 1, characterized in that: The slips (19) are inclined slips (19), the outer wall inclined surface of the slips (19) matches the inner wall inclined surface groove of the chuck piston (18); the slips (19) are mutually supported by slip springs (33).

6. The built-in chuck type dual-motor electric driving force head according to claim 1, characterized in that: The front end of the extension column (32) is also provided with a bolt-connected slip ring (21) to press the slip (19) to prevent its axial movement; a piston front end thrust bearing (20) is provided between the slip ring (21) and the front end cover (3) of the housing (4) to limit the axial movement of the main shaft (6) and the internal parts of the chuck (11).

7. The built-in chuck type dual-motor electric driving force head according to claim 1, characterized in that: A main shaft tail end support bearing (7) is provided between the main shaft (6) and the inner wall of the housing (4).

8. The built-in chuck type dual-motor electric driving force head according to claim 1, characterized in that: A chuck rear end thrust bearing (16) and a gear rear end thrust bearing (15) are arranged on the front and rear sides of the rotating gear (8) to offset the axial force exerted on the main shaft (6) and the chuck (11) in the working state.

9. The built-in chuck type dual-motor electric driving force head according to claim 1, characterized in that: The conversion gear (13) is sleeved on a conversion shaft (14), and the conversion shaft (14) is fixed between the motor I (1) and the motor II (2) and is parallel to the motor shaft (12).

10. The method for clamping and driving a drill rod by a built-in chuck type dual-motor electric drive head as claimed in any one of claims 2 to 9, characterized in that: The following steps are involved: When the motor I is started, the transmission gear fixed to it is driven by its motor shaft, and the transmission belt meshing with it is driven at the same time, and the transmission belt drives the chuck body to rotate around the center line of the main shaft; at this time, the motor II is started at the same time, and the speed is kept the same as that of the motor I, and the two motor shafts rotate in opposite directions. The two motor bevel teeth are meshed with the bevel teeth of the middle shaft, and the bevel teeth of the middle shaft only produce self-rotation but not revolution. The middle shaft, support ring, differential connecting plate, and rotating pinion remain stationary and will not drive the main shaft to rotate; at this time, the chuck piston and the inclined surface slips and the main shaft inside the chuck remain stationary to form a speed difference with the chuck body, and the upper thread buckle of the chuck piston is completed, so that the chuck piston produces an axial displacement in the direction of the front end cover of the shell; the inclined surface slips produce radial displacement under the extrusion of the inclined surface groove of the chuck piston to clamp the drill pipe; when the drill pipe needs to be loosened, the buckle can be removed by reversing the motor I and motor II according to the above steps; After the drill rod is clamped, the two motor shafts of motor I and motor II rotate in the same direction at the same time. Since motor I and motor II are placed opposite each other, the central shaft bevel gear revolves under the drive of the motor bevel gears at both ends, driving the central shaft, differential connecting plate, support ring, and rotating pinion to rotate; the chuck body and the main shaft rotate in the same direction after being driven by the transmission belt and the conversion gear respectively. At this time, the rotator is in the state of clamping the drill rod and rotating normally to complete the drilling action.

Images