A power head for drilling rigs

Abstract

This invention relates to the field of geological exploration technology, and more particularly to a power head for drilling rigs. The power head for drilling rigs includes a hydraulic motor, a transmission assembly, and a spindle assembly. The transmission assembly includes a transmission gear shaft, a driving bevel gear, a driven bevel gear set, an auxiliary bevel gear, and a motor auxiliary drive end. The driving bevel gear drives the driven bevel gear set to rotate the transmission gear shaft along its axis, thereby driving the spindle assembly to rotate. The motor auxiliary drive end can selectively drive the auxiliary gear to rotate, thereby adjusting the speed of the driven bevel gear set. By setting the auxiliary bevel gear and the motor auxiliary drive end, a dual power input adjustment mechanism is formed with the hydraulic motor and the driving bevel gear. When a small range of speed adjustment is required, the motor auxiliary drive end can precisely control the rotational speed of the auxiliary bevel gear, thereby adjusting the rotational speed of the transmission gear shaft through the driven bevel gear set.

Description

Technical Field

[0001] This invention relates to the field of geological exploration technology, and in particular to a power head for drilling rigs. Background Technology

[0002] In existing geological exploration and construction equipment, geological power heads commonly use hydraulic motors as drive devices. However, this type of power source has significant technical bottlenecks during operation: its high-speed operation results in insufficient speed control precision, making it difficult to adjust the rotational speed within a small range, and it cannot adapt to the diverse needs of complex construction conditions, severely restricting construction efficiency. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a power head for drilling rigs, which solves the technical problem of poor control accuracy of the rotation speed of the power head.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0007] This invention provides a power head for a drilling rig, including a housing, a hydraulic motor, a transmission assembly, and a spindle assembly. The transmission assembly includes a transmission gear shaft, a driving bevel gear, a driven bevel gear set, an auxiliary bevel gear, and a motor auxiliary drive end. The driving bevel gear, auxiliary bevel gear, and transmission gear shaft are coaxially arranged. The driven bevel gear set is disposed within the transmission gear shaft and drivenly connected to it. The driven bevel gear set meshes with both the driving bevel gear and the auxiliary bevel gear. The transmission gear shaft meshes with the spindle assembly. The hydraulic motor is connected to the driving bevel gear, and the motor auxiliary drive end is connected to the auxiliary bevel gear. The driving bevel gear drives the driven bevel gear set to rotate the transmission gear shaft along its axis, thereby driving the spindle assembly to rotate. The motor auxiliary drive end can selectively drive the auxiliary bevel gear to rotate, thereby adjusting the speed of the driven bevel gear set.

[0008] Preferably, the motor auxiliary drive end includes an auxiliary drive shaft and a motor. The auxiliary drive shaft is disposed inside the transmission gear shaft and is coaxial with the transmission gear shaft. The auxiliary bevel gear is connected to the drive end of the auxiliary drive shaft, and the motor is connected to the connection end of the auxiliary drive shaft to drive the auxiliary drive shaft to rotate the auxiliary bevel gear.

[0009] Preferably, the driven bevel gear set includes a connecting frame and multiple driven bevel gears; the connecting frame is disposed between the driving bevel gear and the auxiliary bevel gear, and the connecting frame includes a connecting part and multiple connecting shafts. The multiple connecting shafts are equally spaced on the outer periphery of the connecting part, the axis of the connecting part is coaxial with the transmission gear shaft, and the axis of the connecting shaft is perpendicular to the axis of the transmission gear shaft; the multiple connecting shafts are arranged one-to-one with the multiple driven bevel gears, the driven bevel gears are sleeved on the connecting shafts and rotate relative to the connecting shafts, and the end of the connecting shaft is inserted into the transmission gear shaft; each driven bevel gear meshes with the driving bevel gear and the auxiliary bevel gear, and the driven bevel gear drives the transmission gear shaft to rotate along its axis through the connecting frame.

[0010] Preferably, the transmission gear shaft includes a first transmission gear unit and a second transmission gear unit that are detachably connected; the first transmission gear unit and the second transmission gear unit are mated together to form a receiving space that accommodates a driving bevel gear, a driven bevel gear set, an auxiliary bevel gear and an auxiliary drive shaft; the connecting frame is located in the receiving space and the connecting shaft of the connecting frame rests on the upper end face of the second transmission gear unit.

[0011] Preferably, the outer circumference of the auxiliary drive shaft is a smooth surface, and the partial accommodating space of the second transmission gear unit is provided with an internal thread; the auxiliary drive shaft rotates relative to the second transmission gear unit to spiral the lubricating oil at the bottom of the second transmission gear unit upward.

[0012] Preferably, the spindle assembly includes a spindle, a first driven gear, a second driven gear, and a shift gear; the first driven gear and the second driven gear are sleeved on the spindle and rotate relative to the spindle; the shift gear is sleeved on the spindle and is located between the first driven gear and the second driven gear, and the shift gear moves up and down along the axis of the spindle to fix the first driven gear or the second driven gear to the spindle.

[0013] Preferably, the inner ring of the shift gear is provided with an internal spline, and the outer wall of the main shaft is provided with an external spline that mates with the internal spline, and the internal spline and the external spline are slidably connected.

[0014] Preferably, a first driving gear is formed on the outside of the first transmission gear unit; a second driving gear is formed on the outside of the second transmission gear unit; the first driving gear meshes with the first driven gear, and the second driving gear meshes with the second driven gear.

[0015] Preferably, it also includes a housing, with the transmission gear shaft and the main shaft all disposed inside the housing; the lower end of the main shaft extends out of the housing for connection with the pipe; the hydraulic motor is disposed at the upper end of the housing, and the electric motor is disposed at the lower end of the housing.

[0016] Preferably, the transmission gear shaft and the housing, the driven bevel gear and the connecting shaft, the driving bevel gear and the transmission gear shaft, the auxiliary bevel gear and the transmission gear shaft, the first driven gear and the main shaft, the second driven gear and the main shaft, and the main shaft and the housing are all connected by bearings.

[0017] (III) Beneficial Effects

[0018] The beneficial effects of this invention are:

[0019] The drilling rig power head of this invention includes a hydraulic motor, a transmission assembly, and a spindle assembly. The transmission assembly includes a transmission gear shaft, a driving bevel gear, a driven bevel gear set, an auxiliary bevel gear, and a motor auxiliary drive end. The hydraulic motor is connected to the driving bevel gear, and the motor auxiliary drive end is connected to the auxiliary bevel gear. The driving bevel gear drives the driven bevel gear set to rotate, thereby causing the transmission gear shaft to rotate along its own axis, which in turn drives the spindle assembly to rotate. When the speed of the transmission gear shaft is adjusted, the motor auxiliary drive end drives the auxiliary gear to rotate, thereby adjusting the speed of the driven bevel gear set. By setting the auxiliary bevel gear and the motor auxiliary drive end, a dual power input adjustment mechanism is formed. When a small range of speed adjustment is required, the motor auxiliary drive end can precisely control the speed of the auxiliary bevel gear, thereby adjusting the rotational speed of the transmission gear shaft through the driven bevel gear set. This differential speed adjustment method significantly improves the speed control accuracy, and is especially suitable for complex geological conditions where precise control of drilling parameters is required.

[0020] When drilling speed needs adjustment, the motor-assisted drive can quickly adjust the speed, reducing the response delay caused by flow regulation in traditional hydraulic systems and improving construction efficiency. In situations where high-precision speed control is not required, the auxiliary drive can be shut off, and the system reverts to the traditional single hydraulic motor drive mode, avoiding unnecessary energy loss. Simultaneously, this design reduces reliance on high-precision flow control components in the hydraulic system, lowering system complexity and maintenance difficulty, and extending equipment lifespan.

[0021] Meanwhile, the use of bevel gear transmission, leveraging its interlaced shaft transmission characteristics, achieves efficient power transmission while significantly reducing the space occupied by the transmission structure. The transmission assembly layout of this power head is more compact, providing space for optimized design of the overall equipment structure and facilitating installation and integration into different types of drilling rigs, effectively improving the equipment's space utilization. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the power head used in drilling rigs;

[0023] Figure 2 This is a schematic diagram of the connection between the transmission assembly and the main shaft assembly (motor not shown);

[0024] Figure 3 This is a front view of the transmission assembly;

[0025] Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0026] Figure 5 This is a schematic diagram of the transmission assembly.

[0027] Figure 6 for Figure 5 A schematic diagram of the structure after removing the first transmission gear unit;

[0028] Figure 7 This is a front view of the spindle assembly.

[0029] [Explanation of Labels in the Attached Image]

[0030] 1: Hydraulic motor; 2: Transmission assembly; 21: Transmission gear shaft; 211: First transmission gear unit; 2111: First driving gear; 212: Second transmission gear unit; 2121: Second driving gear; 22: Driving bevel gear; 23: Driven bevel gear set; 231: Connecting frame; 232: Driven bevel gear; 24: Auxiliary bevel gear; 25: Auxiliary drive shaft; 3: Main shaft assembly; 31: Main shaft; 32: First driven gear; 33: Second driven gear; 34: Shift gear; 35: Chuck; 4: Housing. Detailed Implementation

[0031] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1 As shown, this embodiment of the invention provides a power head for a drilling rig. The power head includes a hydraulic motor 1, a transmission assembly 2, a spindle assembly 3, and a housing 4. The transmission assembly 2 and the spindle assembly 3 are disposed within the housing 4, and the hydraulic motor 1 is disposed at the upper end of the housing 4. Figure 2 As shown, the hydraulic motor 1 drives the transmission assembly 2 to rotate the spindle assembly 3, which in turn drives the pipe (not shown) below the spindle assembly 3 to rotate via the chuck 35.

[0033] like Figure 4As shown, the transmission assembly 2 includes a transmission gear shaft 21, a driving bevel gear 22, a driven bevel gear set 23, an auxiliary bevel gear 24, and a motor auxiliary drive end. The transmission gear shaft 21 meshes with the main shaft assembly 3. The driving bevel gear 22, the auxiliary bevel gear 24, and the transmission gear shaft 21 are coaxially arranged. The driven bevel gear set 23 is disposed inside the transmission gear shaft 21 and is drivenly connected to the transmission gear shaft 21. The driven bevel gear set 23 meshes with both the driving bevel gear 22 and the auxiliary bevel gear 24. The hydraulic motor 1 is connected to the driving bevel gear 22, and the motor auxiliary drive end is connected to the auxiliary bevel gear 24. The driving bevel gear 22 drives the driven bevel gear set 23 to rotate within the auxiliary bevel gear 24. Since the auxiliary bevel gear 24 is coaxial with the transmission gear shaft 21, the driven bevel gear set 23 drives the transmission gear shaft 21 to rotate along its own axis, ultimately driving the main shaft assembly 3 to rotate. The motor auxiliary drive can selectively drive the auxiliary bevel gear 24 to rotate, thereby adjusting the speed of the driven bevel gear set 23. When acceleration adjustment is required for the spindle assembly 3, the motor auxiliary drive drives the auxiliary bevel gear 24 and the driven bevel gear set 23 to rotate in the same direction. When deceleration adjustment is required for the spindle assembly 3, the motor auxiliary drive drives the auxiliary bevel gear 24 and the driven bevel gear set 23 to rotate in opposite directions.

[0034] Through the auxiliary bevel gear 24 and the auxiliary drive end of the motor, a dual power input regulation mechanism is formed with the hydraulic motor 1 and the driving bevel gear 22. When a small range of speed adjustment is required, the auxiliary drive end of the motor can precisely control the rotational speed of the auxiliary bevel gear 24, which in turn adjusts the rotational speed of the transmission gear shaft 21 through the driven bevel gear set 23. This differential speed regulation method significantly improves the speed control accuracy, and is especially suitable for complex geological conditions where precise control of drilling parameters is required.

[0035] When drilling speed needs adjustment, the motor-assisted drive can quickly adjust the speed, reducing the response delay caused by flow regulation in traditional hydraulic systems and improving construction efficiency. In situations where high-precision speed control is not required, the auxiliary drive can be shut off, and the system reverts to the traditional single hydraulic motor drive mode, avoiding unnecessary energy loss. Simultaneously, this design reduces reliance on high-precision flow control components in the hydraulic system, lowering system complexity and maintenance difficulty, and extending equipment lifespan.

[0036] Meanwhile, the bevel gear transmission method, utilizing its interlaced shaft transmission characteristics, achieves efficient power transmission while significantly reducing the space occupied by the transmission structure. The transmission assembly 2 of this power head has a more compact layout, providing space for the optimized design of the overall equipment structure, and is also easier to install and integrate into different models of drilling equipment, effectively improving the space utilization rate of the equipment.

[0037] like Figure 4As shown, the motor auxiliary drive end includes an auxiliary drive shaft 25 and a motor (not shown). The auxiliary drive shaft 25 is located inside the transmission gear shaft 21 and is coaxial with the transmission gear shaft 21. An auxiliary bevel gear 24 is connected to the drive end of the auxiliary drive shaft 25. The motor is located at the lower end of the housing 4, and the output end of the motor is connected to the connection end of the auxiliary drive shaft 25. The motor drives the auxiliary drive shaft 25 to rotate the auxiliary bevel gear 24, thereby adjusting the speed of the driven bevel gear set 23 on the auxiliary bevel gear 24. By coaxially arranging the auxiliary drive shaft 25 inside the transmission gear shaft 21 and directly driving the auxiliary bevel gear 24 to rotate with the motor, an independent and compact auxiliary power adjustment module is formed. This not only shortens the power transmission path and reduces transmission losses but also highly integrates the auxiliary drive with the main drive, facilitating precise speed control. Furthermore, as a drive source, the motor has a faster response speed compared to traditional hydraulic drive methods, enabling more sensitive speed adjustment and significantly improving the overall speed regulation performance of the power head.

[0038] like Figure 6 As shown, the driven bevel gear set 23 includes a connecting frame 231 and a plurality of driven bevel gears 232, with the connecting frame 231 disposed in the gap between the driving bevel gear 22 and the auxiliary bevel gear 24. Figure 4 As shown, the connecting frame 231 includes an integrally formed connecting part and multiple connecting shafts. The multiple connecting shafts are equally spaced on the outer periphery of the connecting part. The axis of the connecting part is coaxial with the transmission gear shaft 21, and the axis of the connecting shaft is perpendicular to the axis of the transmission gear shaft 21. The multiple connecting shafts are correspondingly arranged with multiple driven bevel gears 232. The driven bevel gears 232 are sleeved on the connecting shafts through bearings. The driven bevel gears 232 rotate relative to the connecting shafts. The end of the connecting shaft is inserted into the transmission gear shaft 21. Each driven bevel gear 232 simultaneously meshes with the driving bevel gear 22 and the auxiliary bevel gear 24. The driven bevel gears 232 drive the transmission gear shaft 21 to rotate along its axis through the connecting frame 231. In this embodiment, multiple driven bevel gears 232 are arranged at equal intervals. On the one hand, the load can be evenly distributed, avoiding excessive force on a single driven bevel gear 232 that would lead to increased wear and extend the service life of the transmission components. On the other hand, multi-gear meshing transmission can effectively improve transmission smoothness and reduce vibration and noise during transmission, making it particularly suitable for geological exploration operations with high requirements for operational stability.

[0039] In this embodiment, in order to ensure the stable rotation of the transmission gear shaft 21, four driven bevel gears 232 are provided, and four connecting shafts are provided on the corresponding connecting frame 231, which are then integrally formed with the connecting part to form a cross shaft.

[0040] like Figure 5As shown, to facilitate the installation, inspection, and maintenance of core components such as the driving bevel gear 22 and the driven bevel gear set 23, the transmission gear shaft 21 includes a detachably connected first transmission gear unit 211 and second transmission gear unit 212. The first transmission gear unit 211 and the second transmission gear unit 212 are joined together to form a receiving space for accommodating the driving bevel gear 22, the driven bevel gear set 23, the auxiliary bevel gear 24, and the auxiliary drive shaft 25. The connecting frame 231 is located within the receiving space, and the connecting shaft of the connecting frame 231 rests on the upper end face of the second transmission gear unit 212, thereby providing a stable support structure for the driven bevel gear set 23 and ensuring the stability of the transmission system under high-speed operation.

[0041] like Figure 7 As shown, the spindle assembly 3 includes a spindle 31, a first driven gear 32, a second driven gear 33, and a shift gear 34. The transmission gear shaft 21 and the spindle 31 are both located inside the housing 4, and the lower end of the spindle 31 extends out of the housing 4 for connection with the pipe.

[0042] The first driven gear 32 and the second driven gear 33 are mounted on the main shaft 31 via bearings, and the first driven gear 32 and the second driven gear 33 respectively achieve relative rotational motion with the main shaft 31. A shift gear 34 is mounted on the main shaft 31, located between the first driven gear 32 and the second driven gear 33. The shift gear 34 moves up and down along the axis of the main shaft 31 to fix either the first driven gear 32 or the second driven gear 33 to the main shaft 31, thereby adjusting the speed of the main shaft 31. Figure 3 As shown, a first driving gear 2111 is formed on the outside of the first transmission gear unit 211 of the transmission gear shaft 21, and a second driving gear 2121 is formed on the outside of the second transmission gear unit 212 of the transmission gear shaft 21. The first driving gear 2111 meshes with the first driven gear 32, and the second driving gear 2121 meshes with the second driven gear 33.

[0043] The spindle assembly 3, through the installation of a movable shift gear 34, enables selective connection between the spindle 31 and different driven gears, thus forming multi-stage transmission ratios. This allows the power head to flexibly switch between different speed and torque output modes according to actual construction needs, such as selecting a high-speed mode when drilling in soft soil and switching to a high-torque mode when drilling in hard rock, greatly enhancing the equipment's adaptability to complex geological conditions. Simultaneously, the relative rotational design between the driven gear and the spindle 31 reduces impact during gear shifting, ensuring smooth power transmission.

[0044] To ensure stable movement of the shift gear 34, an internal spline is machined on the inner ring of the shift gear 34, and an external spline is machined on the outer wall of the main shaft 31 to mate with the internal spline. The internal and external splines are slidably connected. When the shift gear 34 moves along the axis of the main shaft 31, the engagement of the internal and external splines ensures accurate positioning of the shift gear 34, preventing transmission failure or abnormal wear due to misalignment. This structure is simple and practical, ensuring shift reliability while reducing manufacturing and assembly difficulty and improving production efficiency.

[0045] To achieve self-lubrication of the bevel gear transmission components, the outer circumference of the auxiliary drive shaft 25 is a smooth surface, and a portion of the accommodating space of the second transmission gear unit 212 is provided with internal threads. The auxiliary drive shaft 25 and the second transmission gear unit 212 rotate relative to each other. When the transmission gear shaft 21 rotates, and consequently the second transmission gear unit 212 rotates relative to the auxiliary drive shaft 25, the lubricating oil at the bottom of the second transmission gear unit 212 spirals upwards to the bevel gear transmission components for lubrication. This self-lubricating structure eliminates the need for an additional lubrication pump or complex oil circuit system, simplifying the equipment structure and reducing maintenance costs. Simultaneously, continuous and uniform lubrication effectively reduces frictional wear on gears, shafts, and other components, extending the equipment's service life, making it particularly suitable for long-term continuous operation in field construction environments.

[0046] In the power head for drilling rigs of the present invention, each rotary connection part, including the transmission gear shaft 21 and housing 4, the driven bevel gear 232 and connecting shaft, the driving bevel gear 22 and transmission gear shaft 21, the auxiliary bevel gear 24 and transmission gear shaft 21, the first driven gear 32 and main shaft 31, the second driven gear 33 and main shaft 31, and the main shaft 31 and housing 4, is equipped with corresponding types of bearings to achieve precise and low-friction rotary motion. Considering the differences in load characteristics, speed requirements, and installation space limitations of different connection parts, each part can select an appropriate bearing type according to the actual working conditions, such as deep groove ball bearings, tapered roller bearings, angular contact ball bearings, etc. Specific bearing models and selection details will not be further elaborated here.

[0047] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] 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. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A power head for a drilling rig, characterized in that, It includes a hydraulic motor (1), a transmission assembly (2), and a spindle assembly (3). The transmission assembly (2) includes a transmission gear shaft (21), a driving bevel gear (22), a driven bevel gear set (23), an auxiliary bevel gear (24), and a motor auxiliary drive end. The driving bevel gear (22), the auxiliary bevel gear (24), and the transmission gear shaft (21) are coaxially arranged. The driven bevel gear set (23) is arranged inside the transmission gear shaft (21) and is drivenly connected to the transmission gear shaft (21). The driven bevel gear set (23) meshes with the driving bevel gear (22) and the auxiliary bevel gear (24) respectively. The transmission gear shaft (21) meshes with the main shaft assembly (3). The hydraulic motor (1) is connected to the active bevel gear (22), the motor auxiliary drive end is connected to the auxiliary bevel gear (24), the active bevel gear (22) drives the driven bevel gear set (23) to drive the transmission gear shaft (21) to rotate along the axis of the transmission gear shaft (21), thereby driving the main shaft assembly (3) to rotate; The motor auxiliary drive end can selectively drive the auxiliary bevel gear (24) to rotate, so as to adjust the speed of the driven bevel gear set (23); The driven bevel gear set (23) includes a connecting frame (231) and a plurality of driven bevel gears (232). The connecting frame (231) is disposed between the active bevel gear (22) and the auxiliary bevel gear (24). The connecting frame (231) includes a connecting part and a plurality of connecting shafts. The plurality of connecting shafts are disposed at equal intervals on the outer periphery of the connecting part. The axis of the connecting part is coaxial with the transmission gear shaft (21), and the axis of the connecting shaft is perpendicular to the axis of the transmission gear shaft (21). Multiple connecting shafts are provided in a one-to-one correspondence with multiple driven bevel gears (232). The driven bevel gears (232) are sleeved on the connecting shafts and rotate relative to the connecting shafts. The end of the connecting shaft is inserted into the transmission gear shaft (21). Each of the driven bevel gears (232) meshes with the driving bevel gear (22) and the auxiliary bevel gear (24), and the driven bevel gear (232) drives the transmission gear shaft (21) to rotate along its axis through the connecting frame (231).

2. The power head for drilling rigs as described in claim 1, characterized in that: The motor auxiliary drive end includes an auxiliary drive shaft (25) and a motor. The auxiliary drive shaft (25) is disposed inside the transmission gear shaft (21) and is coaxial with the transmission gear shaft (21). The auxiliary bevel gear (24) is connected to the drive end of the auxiliary drive shaft (25), and the motor is connected to the connection end of the auxiliary drive shaft (25) to drive the auxiliary drive shaft (25) to rotate the auxiliary bevel gear (24).

3. The power head for drilling rigs as described in claim 2, characterized in that: The transmission gear shaft (21) includes a first transmission gear unit (211) and a second transmission gear unit (212) that are detachably connected. The first transmission gear unit (211) and the second transmission gear unit (212) form a receiving space inside their docking chamber to accommodate the driving bevel gear (22), the driven bevel gear set (23), the auxiliary bevel gear (24) and the auxiliary drive shaft (25); The connecting frame (231) is located within the accommodating space and the connecting shaft of the connecting frame (231) rests on the upper end face of the second transmission gear unit (212).

4. The power head for drilling rigs as described in claim 3, characterized in that: The outer periphery of the auxiliary drive shaft (25) is a smooth surface, and the second transmission gear unit (212) has an internal thread in part of its accommodating space; The auxiliary drive shaft (25) rotates relative to the second transmission gear unit (212) to spiral the lubricating oil at the bottom of the second transmission gear unit (212) upward.

5. The power head for drilling rigs as described in claim 3, characterized in that: The main shaft assembly (3) includes a main shaft (31), a first driven gear (32), a second driven gear (33), and a shift gear (34). The first driven gear (32) and the second driven gear (33) are sleeved on the main shaft (31) and rotate relative to the main shaft (31); The shift gear (34) is sleeved on the main shaft (31) and located between the first driven gear (32) and the second driven gear (33). The shift gear (34) moves up and down along the axial direction of the main shaft (31) to fix the first driven gear (32) or the second driven gear (33) to the main shaft (31).

6. The power head for drilling rigs as described in claim 5, characterized in that: The inner ring of the shift gear (34) is provided with an inner spline, and the outer wall of the main shaft (31) is provided with an outer spline that mates with the inner spline. The inner spline and the outer spline are slidably connected.

7. The power head for drilling rigs as described in claim 5, characterized in that: A first drive gear (2111) is formed on the outside of the first transmission gear unit (211). A second drive gear (2121) is formed on the outside of the second transmission gear unit (212). The first driving gear (2111) meshes with the first driven gear (32), and the second driving gear (2121) meshes with the second driven gear (33).

8. The power head for drilling rigs as described in claim 5, characterized in that: It also includes a housing (4), in which the transmission gear shaft (21) and the main shaft (31) are both located inside the housing (4); The lower end of the main shaft (31) extends out of the housing (4) for connection with the pipe fitting; The hydraulic motor (1) is located at the upper end of the housing (4), and the electric motor is located at the lower end of the housing (4).

9. The power head for drilling rigs as described in claim 8, characterized in that: The transmission gear shaft (21) and the housing (4), the driven bevel gear (232) and the connecting shaft, the driving bevel gear (22) and the transmission gear shaft (21), the auxiliary bevel gear (24) and the transmission gear shaft (21), the first driven gear (32) and the main shaft (31), the second driven gear (33) and the main shaft (31), and the main shaft (31) and the housing (4) are all connected by bearings.

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