Power head and rotary drilling rig

Abstract

The power head comprises a power box which is fixedly connected with a sliding frame through connecting plates arranged on the two sides, a buffering device is fixed to the top of the power box, driving sleeve equipment is arranged at the bottom of the power box, and a pile casing driver of the driving sleeve equipment is detachably connected with a sleeve. The power box can move up and down in the extending direction of the mast through the sliding frame so that the driving sleeve equipment and the drill rod can have a preset state. The power box, the hydraulic system, the buffer device and the driving sleeve equipment are combined, the buffer device effectively absorbs impact force and vibration generated in the drilling process, the service life is prolonged, a pile casing driver of the driving sleeve equipment is detachably connected with the casing pipe, the power box can move up and down in the extending direction of the mast through the sliding frame, and the driving sleeve equipment can move up and down. Therefore, the cutting efficiency and the guidance quality are improved, and drilling tasks can be stably and efficiently completed under various geological conditions.

Description

Technical Field

[0001] This utility model relates to the field of rotary drilling rig technology, and in particular to a power head and a rotary drilling rig. Background Technology

[0002] Rotary drilling rigs are a construction technology suitable for hole-forming operations in building foundation engineering. They have advantages such as high installed power, good hole quality, high construction efficiency, and low environmental pollution, and are widely used in underground engineering, foundation treatment, and pile foundation construction projects.

[0003] In existing technologies, rotary drilling rigs consist of a power head, drill rod, drill bit, and hydraulic system. The power head of the rotary drilling rig is mainly used for drilling and propulsion, playing a crucial role in the drilling process, especially in construction under hard rock and complex geological conditions.

[0004] However, traditional power heads are prone to extreme wear and low cutting efficiency when dealing with complex geological conditions, which leads to longer construction cycles and slower drilling speeds. They are also prone to deviation, affecting the accuracy of drilling and the precision and timeliness of drilling positions. Utility Model Content

[0005] To address the problems of traditional power heads suffering from severe wear and low cutting efficiency when dealing with complex geological conditions, leading to prolonged construction periods and slower drilling speeds, as well as being prone to deviations that affect drilling accuracy, precision, and timeliness, this invention provides a power head drive sleeve and a rotary drilling rig. The technical solution adopted is as follows:

[0006] According to a first aspect of this application, a power head is provided for use in a rotary drilling rig, the power head comprising:

[0007] The sliding frame has a cuboid structure and is connected to the main body of the rotary drilling rig via a sliding device.

[0008] A power box is used to provide power to the drill pipe. The power box is fixedly connected to the sliding frame through connecting plates on both sides.

[0009] A buffer device is fixed to the top of the power box, and the buffer device is used to mitigate the impact of the power head;

[0010] A hydraulic system is installed on the power box, and the hydraulic system is located between the buffer device and the sliding frame;

[0011] A drive sleeve device is disposed at the bottom of the power box. The drive sleeve device includes a disc assembly, a protective sleeve driver, and a sleeve arranged coaxially in sequence. The protective sleeve driver is detachably connected to the sleeve.

[0012] In the assembled state, the power box can move up and down along the extension direction of the mast via the sliding frame, so that the drive sleeve and the drill pipe are in a preset state.

[0013] In some embodiments, the power box has a first output shaft and a second output shaft, the first output shaft being slidably connected to the drill pipe, and the second output shaft being detachably connected to the drive sleeve device.

[0014] In some embodiments, the disk assembly includes a drive disk and a connecting disk, the connecting disk being sleeved on the drive disk, the top of the drive disk being mounted on the power box, and the bottom being connected to the connecting disk and the protective sleeve driver via a connecting shaft.

[0015] In some embodiments, the end of the sleeve driver away from the connecting disc is connected to the sleeve via a first pin;

[0016] The drive sleeve device also includes a boot, which is located at the bottom end of the sleeve and connected to the sleeve via a second pin.

[0017] In some embodiments, the power box includes:

[0018] The housing is connected to the sliding frame via the connecting plate;

[0019] A sleeve is fitted onto the axial position of the housing. The sleeve is equipped with a rotation component and a drive component. The drive component is used to drive the sleeve to drive the drill rod to rotate circumferentially along the sleeve.

[0020] The drive assembly includes a gear ring and multiple drive gears mounted inside the housing, and a driven gear disposed on the sleeve. The drive gears mesh with the driven gears and the gear ring respectively.

[0021] In some embodiments, a plurality of key bars are provided on the inner wall of the sleeve along the circumferential direction of the sleeve, and the key bars extend along the axial direction of the sleeve;

[0022] The key bar includes a plurality of first key bars and a plurality of second key bars. The plurality of first key bars are fixedly connected to the sleeve, and the plurality of second key bars are detachably connected to the sleeve. The first key bars are located between two adjacent second key bars.

[0023] In some embodiments, one end of the second key bar is provided with an L-shaped limiting member, the limiting member having a plurality of threaded holes, the plurality of threaded holes being arranged at intervals along the extending direction of the limiting member;

[0024] The limiting member and the second key bar have a groove. In the assembled state, the end of the sleeve is engaged in the groove. The power box transmits torque and pressure through the cooperation between the key bar and the drill rod.

[0025] In some embodiments, the hydraulic system is a hydraulic motor, and a speed reducer is provided on the top of the housing near the hydraulic motor. The speed reducer is used to control the rotational speed and transmitted torque of the power head.

[0026] In some embodiments, the buffer device includes a buffer pressure plate, a plurality of spring assemblies, and a shock-absorbing chassis, wherein the plurality of spring assemblies are located between the buffer pressure plate and the shock-absorbing chassis and are spaced apart circumferentially along the buffer pressure plate.

[0027] According to a second aspect of this application, a rotary drilling rig is provided, including a drilling rig body, a mast mounted on the drilling rig body, a drill rod and a drill string at one end of the drill rod, and the power head described in the first aspect;

[0028] The power head is mounted on the mast.

[0029] The technological advancements achieved by this invention compared to existing technologies are as follows:

[0030] This utility model combines a power box, a hydraulic system, a buffer device, and a drive sleeve device. The buffer device effectively absorbs the impact and vibration generated during drilling, extending its service life. The drive sleeve device includes a disc assembly, a casing driver, and a casing arranged coaxially in sequence. The casing driver and the casing are detachably connected. In the assembled state, the power box can move up and down along the extension direction of the mast via a sliding frame, so that the drive sleeve device and the drill pipe have preset states, thereby improving cutting efficiency and guidance, and enabling stable and efficient completion of drilling tasks under various geological conditions. Attached Figure Description

[0031] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0032] In the attached diagram:

[0033] Figure 1 This is a schematic diagram of the structure of the rotary drilling rig of this utility model;

[0034] Figure 2 This is a schematic diagram of the power head structure in this utility model;

[0035] Figure 3 This is a partial schematic diagram of the power head in this utility model;

[0036] Figure 4 This is a cross-sectional schematic diagram of the power box in this utility model;

[0037] Figure 5 This is a schematic diagram of the drive sleeve device in this utility model;

[0038] Figure 6 This is a schematic diagram of the structure of the power head of this utility model;

[0039] Figure 7 This is a schematic diagram of the sleeve structure in this utility model.

[0040] In the diagram: 1. Sliding frame; 11. Sliding device; 2. Power box; 21. First output shaft; 22. Second output shaft; 23. Housing; 24. Sleeve; 25. Rotary assembly; 26. Drive assembly; 260. Gear ring; 261. Drive gear; 262. Driven gear; 3. Buffer device; 31. Buffer pressure plate; 32. Spring assembly; 33. Shock-absorbing chassis; 4. Hydraulic system; 5. Drive sleeve device; 51. Disc assembly; 5 10. Drive plate; 511. Connecting plate; 52. Casing drive; 53. Casing; 54. Connecting shaft; 55. First pin; 56. Second pin; 57. Shoe; 6. Connecting plate; 7. Key; 71. First key; 72. Second key; 8. Limiting element; 81. Threaded hole; 82. Groove; 9. Reducer; 100. Power head; 200. Drill rig body; 300. Mast; 400. Drill rod; 500. Drill tool. Detailed Implementation

[0041] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this utility model will be described below with reference to the accompanying drawings.

[0042] like Figures 1 to 7As shown, this utility model discloses a power head applied to a rotary drilling rig. The rotary drilling rig is a construction equipment used for hole-forming operations in foundation engineering. The power head 100 drives the drill rod 400 to rotate, possessing high torque output capability to achieve efficient drilling operations and adapt to drilling needs under different geological conditions. The power head 100 includes a sliding frame 1, a power box 2, a buffer device 3, a hydraulic system 4, and a drive sleeve device 5. The sliding frame 1 has a cuboid structure, which provides stability and reliability. It is connected to the main body 200 of the rotary drilling rig via a sliding device 11. In one example, the sliding device... 11 includes a guide rail 110 and a pulley 111. The guide rail 110 is fixed to the surface of the mast 300, and the pulley 111 is installed on the side of the sliding frame 1 facing the mast 300. During use, the pulley 111 cooperates with the guide rail 110 to enable the sliding frame 1 to move relative to the mast 300. The power box 2 is used to provide power to the drill pipe 400. The power box 2 is fixedly connected to the sliding frame 1 through the connecting plates 6 provided on both sides. The fixed connection can be a bolt connection or welding, etc., as long as the power box 2 can be installed on the sliding frame 1. This application does not impose too many restrictions on this, so as to ensure stability and safety during use.

[0043] Continue to refer to Figures 1 to 7 As shown, the buffer device 3 is fixed to the top of the power box 2. The buffer device 3 is used to mitigate and absorb the impact of the power head 100, thereby avoiding damage to the power head 100 and the drilling rig body 200, thus improving the service life and stability of the rotary drilling rig. The hydraulic system 4 is installed on the power box 2 and is located between the buffer device 3 and the sliding frame 1. The hydraulic system 4 provides the necessary hydraulic support for the power head 100 to ensure smooth operation. The hydraulic system controls the moving speed and force of the power box by adjusting the pressure, so that the power head 100 can be finely adjusted in different working environments, thereby improving work efficiency. The drive sleeve device 5 is set at the bottom of the power box 2. The drive sleeve device 5 includes a disc assembly 51, a casing driver 52 and a sleeve 53 arranged coaxially in sequence. The casing driver 52 and the sleeve 53 are detachably connected, so that the operator can quickly disassemble and assemble them when replacing or repairing, reducing the downtime of the rotary drilling rig and ensuring normal operation.

[0044] In the assembled state, the power box 2 can be moved along the extension direction of the mast 300 via the sliding frame 1 (e.g., Figure 1The drive sleeve 5 and drill rod 400 move up and down (in the z direction shown in the diagram) to achieve preset states, thus adapting to different geological layers. In the first preset state, the sliding frame 1 moves the power box 2 downwards, bringing the drive sleeve 5 and drill rod 400 closer to the ground. The power box 2 then rotates the drill rod 400 and drive sleeve 5, performing drilling. In the second preset state, the sliding frame 1 moves the power box 2 upwards, moving the drive sleeve 5 and drill rod 400 away from the ground. The power box 2 then rotates the drill rod 400 and drive sleeve 5, bringing up soil from the ground, thus completing the drilling operation. It should be noted that in this application, the geological layers from the ground downwards are, in order, miscellaneous fill soil, cohesive gravel, sandy mudstone, and weathered limestone.

[0045] In some embodiments, such as Figures 1 to 3 As shown, the power box 2 has a first output shaft 21 and a second output shaft 22. The first output shaft 21 is slidably connected to the drill rod 400. The first output shaft 21 is used to transmit the power of the power box 2 to the drill rod 400 to drive the drill bit to rotate. The second output shaft 22 is detachably connected to the drive sleeve device 5, so that the drive sleeve device 5 can be quickly disassembled and reassembled when it needs to be replaced, repaired or adjusted. This effectively reduces the maintenance cost and downtime of the rotary drilling rig, and also improves the flexibility of the power head. The connection part can adopt a quick connection device, such as a quick-release connector, to ensure that disassembly is convenient and does not affect the reliability of the overall connection.

[0046] In some embodiments, such as Figure 2 , Figure 3 and Figure 5 As shown, the disk assembly 51 includes a drive disk 510 and a connecting disk 511. The top of the drive disk 510 is mounted on the power box 2, which can receive and transmit power from the power box 2, ensuring stable power output. The bottom is connected to the connecting disk 511 and the casing driver 52 via the connecting shaft 54. The surface of the drive disk 510 is made of high-strength, wear-resistant material, which can effectively reduce the friction generated when in contact with other components and improve operating efficiency. For example, the drive disk 510 is made of alloy steel. The connecting disk 511 has a circular structure and is sleeved on the drive disk 510. The connecting disk 511 stably transmits the power of the drive disk 510 to the casing driver 52. During use, the casing driver 52 receives the power of the drive disk 510 and the connecting disk 511 through the connecting shaft 54 ​​and converts it into the rotational force of the casing 53. Through cooperation with the casing 53, the casing driver 52 ensures the effective cutting and advancement of the drill pipe in the formation.

[0047] In some embodiments, such as Figure 2As shown, the end of the sleeve actuator 52 furthest from the connecting disc 511 is detachably connected to the sleeve 53 via a first pin 55, facilitating the precise placement of multiple sleeves 53 stacked together. The first pin 55 not only ensures the linkage between the sleeve actuator 52 and the sleeve 53 but also possesses a certain degree of shear and bending resistance, ensuring that the sleeve actuator 52 can stably drive the sleeve 53 to move and place during operation. In one example, wear-resistant collars are provided at both ends of the first pin 55 to reduce direct friction at the connection point, thereby improving service life.

[0048] The drive sleeve device 5 also includes a shoe 57, which is located at the bottom end of the casing 53 and connected to the casing 53 via a second pin 56. The shoe 57 protects the bottom end of the casing 53 and provides additional support during drilling. During operation, the shoe 57 bears the frictional force of the ground layer and effectively guides the casing 53, ensuring the stability of the drill string 500 on the drill pipe 400 during operation.

[0049] In some embodiments, such as Figures 1 to 6 As shown, the power box 2 includes a housing 23 and a sleeve 24. The housing 23 is connected to the sliding frame 1 via a connecting plate 6. The housing 23 is made of high-strength alloy steel to ensure it can withstand vibration and impact loads during drilling operations. The housing 23 can be a cuboid structure or a main structure, as long as it can be connected to the sliding frame 1. The sleeve 24 is fitted at the axial position of the housing 23. The sleeve 24 is equipped with a rotating assembly 25 and a drive assembly 26. The housing 23 has a hollow internal structure, providing sufficient space for the rotating assembly 25 and the drive assembly 26. The rotating assembly 25 provides rotational power to the drill rod 400, ensuring that the rotation of the drill rod 400 can be smoothly and stably transmitted to the drill tool 500, ensuring efficient drilling during the drilling process. The drive assembly 26 is used to drive the sleeve 24 to drive the drill rod 400 along the circumference of the sleeve 24 (e.g., ...). Figure 1 The drive assembly 26 can be a gear drive, a worm gear drive, or a hydraulic drive, etc., and can be adapted as needed. For example, the drive assembly 26 adopts a gear drive. The drive assembly 26 includes a gear ring 260 and multiple drive gears 261 installed in the housing 23, and a driven gear 262 set on the sleeve 24. The drive gears 261 mesh with the driven gears 262 and the gear ring 260 respectively. The multiple drive gears 261 transmit power to the driven gears 262, which can increase the power transmission efficiency and ensure that the generated load can be evenly distributed. The driven gears 262 are responsible for converting the power of the drive gears 261 into the rotational power of the sleeve 24, thereby driving the drill rod 400 to work.

[0050] In some embodiments, such as Figure 1 and Figure 7As shown, along the circumference of sleeve 24 (e.g.) Figure 1 (as shown in the H direction), the inner wall of the sleeve 24 is provided with multiple key bars 7, the key bars 7 are along the axial direction of the sleeve 24 (as shown in the H direction). Figure 1 Extending in the Z direction as shown, during use, the key bar 7 can cooperate with the drill rod 400 to ensure that the position of the drill rod 400 is not easily shifted, and can effectively drive the drill rod 400 to rotate and perform drilling work.

[0051] The key bar 7 includes several first key bars 71 and several second key bars 72. The first key bars 71 are fixedly connected to the sleeve 24. The fixed connection can be welding, threaded connection, etc., as long as it is installed on the sleeve 24. This application does not impose too many restrictions on this. The second key bars 72 are detachably connected to the sleeve 24. During use, the operator can adapt the number of key bars 7 according to the needs to ensure close cooperation with the drill pipe 400. In one example, the first key bars 71 are located between two adjacent second key bars 72, that is, the first key bars 71 and the second key bars 72 are spaced apart to ensure the stability between the key bars 7, while evenly distributing the load on the inner wall of the sleeve 24 to ensure uniform force distribution. The detachable second key bars 72 facilitate the operator's inspection and maintenance, so as to achieve quick disassembly and replacement, thereby saving maintenance time and costs and ensuring the efficiency and stability of power transmission.

[0052] In some embodiments, the detachable nature of the second key bar 72 and the sleeve 24 can be adapted as needed, for example, as... Figure 7 As shown, one end of the second key bar 72 is provided with an L-shaped limiting member 8. When connected to the sleeve 24, it can effectively limit the position of the second key bar 72 and ensure that the second key bar 72 is tightly fitted to the inner wall of the sleeve 24, effectively preventing power loss due to displacement or loosening. The limiting member 8 is provided with multiple threaded holes 81, which are arranged at intervals along the extension direction of the limiting member 8. The operator can pass the connecting parts (such as bolts) through the threaded holes 81 to connect the second key bar 72 to the sleeve 24. It should be noted that there can be two, four, six, etc., threaded holes 81, as long as the second key bar 72 can be connected to the sleeve 24.

[0053] The limiting member 8 and the second key bar 72 have a groove 82. The shape inside the groove 82 matches the shape of the end of the sleeve 24. In the assembled state, the end of the sleeve 24 is engaged in the groove 82. At the same time, the connecting member (e.g., a bolt) passes through the threaded hole 81 on the limiting member 8, thereby connecting the second key bar 72 and the sleeve 24. The power box 2 transmits torque and pressure through the cooperation between the key bar 7 and the drill rod 400.

[0054] In some embodiments, the hydraulic system 4 is a hydraulic motor. A hydraulic pump pumps hydraulic oil to the hydraulic motor, which then enters the pump chamber. After pressure conversion, the rotor inside the hydraulic motor begins to rotate. The motor's rotational speed is proportional to the pump's flow rate, while the torque is proportional to the hydraulic system's pressure. In this process, the hydraulic system not only provides power but also regulates the motor's rotational speed and output torque by controlling the flow rate and pressure, ensuring the normal operation of the power box 2. A reducer 9 is located on the top of the housing 23 near the hydraulic motor. The reducer 9 controls the rotational speed and torque transmission of the power head 100. During operation, the hydraulic motor provides a stable power source, while the reducer 9 converts the power into a low-speed, high-torque output suitable for drilling operations through gear ratios. This synergistic effect not only ensures the high efficiency of drilling operations but also enhances the reliability and stability of the power system.

[0055] In some embodiments, the buffer device 3 is used to absorb and mitigate the impact force generated during drilling, reduce equipment wear, ensure the normal operation of the power head 100, and improve the stability and durability of the power head 100. The buffer device 3 includes a buffer pressure plate 31, multiple spring assemblies 32, and a shock-absorbing chassis 33. The buffer pressure plate 31 has a circular structure and is coaxially arranged with the shock-absorbing chassis 33. The multiple spring assemblies 32 are located between the buffer pressure plate 31 and the shock-absorbing chassis 33, and are arranged along the circumference of the buffer pressure plate 31 (e.g., along the circumference of the buffer pressure plate 31). Figure 1 As shown in the H direction, the spring assembly 32 is a return spring, which effectively absorbs the energy transmitted by the impact and the force brought by the end of the drill rod 400. The shock-absorbing chassis 33 is located at the bottom of the buffer pressure plate 31, which is used to fix and support the buffer pressure plate 31, and can withstand the reaction force of the buffer pressure plate 31 and the spring assembly, thereby enhancing the buffering effect.

[0056] When the power head 100 is working, the contact between the drill pipe 400 and the underground formation generates a certain impact force. This impact force is transmitted to the spring assembly 32 through the buffer pressure plate 31. When the spring assembly 32 absorbs the impact force, it undergoes elastic deformation, converting the original kinetic energy into elastic potential energy, thereby slowing down the propagation of the shock wave. After the impact force is released, the spring assembly 32 returns to its initial state, effectively reducing the impact force and vibration generated during drilling, thus protecting the power head 100, improving operational stability, and extending its service life.

[0057] This application provides a rotary drilling rig, including a drilling rig body 200, a mast 300 mounted on the drilling rig body 200, a drill rod 400 and a drill string 500 at one end of the drill rod 400, and the aforementioned power head 100.

[0058] The power head 100 is mounted on the mast 300. During use, the power head can be moved to the required area to carry out relevant operations. At the same time, the power head 100 is driven by the hydraulic system 4 to rotate the output shaft of the power head 100. The high speed is converted into a low speed and high torque output suitable for drilling by the reducer 9. The power is transmitted to the drill rod 400, and then the drill rod 400 drives the drill tool 500 to carry out drilling operations.

[0059] The working principle of the power head and rotary drilling rig in this application is as follows:

[0060] like Figures 1 to 7 As shown, first, connect the disk assembly 51 of the drive sleeve device 5 to the power box 2 of the power head 100, and then install the protective sleeve driver 52 on the connecting disk 511 of the disk assembly 51.

[0061] Next, the 4-meter-long sleeve 53 is connected to the boot 57 via the second pin 56, and then together they are detachably installed on the sleeve drive 52 via the first pin 55. For example, the sleeve drive 52 and the sleeve 53 are connected with a quick-change wrench for easy disassembly and assembly by the operator.

[0062] After the operators determine the pile position, they use the power head 100 to drive the casing 53 for drilling. The hydraulic system 4 on the power head 100 provides power to drive the output shaft of the power box 2 to rotate. The rotation transmits power to the drill rod 400. The reducer 9 adjusts the speed and output torque to ensure efficient drilling of the drill bit 500 on the drill rod 400 in different soil layers.

[0063] During drilling, the buffer device 3 of the power head 100 absorbs the impact force, reduces wear and tear on the rotary drilling rig, and maintains stable operation. After drilling the first casing, the second casing can be lifted by the auxiliary winch on the main body 200 and connected to the first casing. When connecting casing 53, first remove the lifting ring on the first casing on the main body 200, and then lift the second casing above the jaws. The length of the second casing 53 is determined based on the specific site conditions such as the stratum, the breaking depth, and the size of the site. Clean the two joints of casing 53 to be connected, ensuring there are no debris. Apply grease to the threaded parts of casing 53, check that the sealing ring on casing 53 is in place and undamaged, insert the joints in the center, and tighten the connecting parts (such as bolts) diagonally to prevent loosening.

[0064] Then, continue drilling. If difficulties are encountered in drilling the casing 53 during the drilling process, a rotary drill bit needs to be used to enter the middle of the casing 53 to remove soil.

[0065] Finally, the power head 100 drives the casing 53 to drill and the rotary drill bit to drill for soil removal. These two drilling methods are carried out alternately until the designed depth is reached, and the drilling work is completed.

[0066] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A power head, characterized in that, Applied to rotary drilling rigs, the power head includes: The sliding frame has a cuboid structure and is connected to the main body of the rotary drilling rig via a sliding device. A power box is used to provide power to the drill pipe. The power box is fixedly connected to the sliding frame through connecting plates on both sides. A buffer device is fixed to the top of the power box, and the buffer device is used to mitigate the impact of the power head; A hydraulic system is installed on the power box, and the hydraulic system is located between the buffer device and the sliding frame; A drive sleeve device is disposed at the bottom of the power box. The drive sleeve device includes a disc assembly, a protective sleeve driver, and a sleeve arranged coaxially in sequence. The protective sleeve driver is detachably connected to the sleeve. In the assembled state, the power box can move up and down along the extension direction of the mast via the sliding frame, so that the drive sleeve and the drill pipe are in a preset state.

2. The power head according to claim 1, characterized in that, The power box has a first output shaft and a second output shaft. The first output shaft is slidably connected to the drill rod, and the second output shaft is detachably connected to the drive sleeve device.

3. The power head according to claim 1, characterized in that, The disk assembly includes a drive disk and a connecting disk. The connecting disk is sleeved on the drive disk. The top of the drive disk is mounted on the power box, and the bottom is connected to the connecting disk and the protective sleeve driver via a connecting shaft.

4. The power head according to claim 3, characterized in that, The end of the sleeve driver away from the connecting plate is connected to the sleeve via a first pin. The drive sleeve device also includes a boot, which is located at the bottom end of the sleeve and connected to the sleeve via a second pin.

5. The power head according to claim 1, characterized in that, The power box includes: The housing is connected to the sliding frame via the connecting plate; A sleeve is fitted onto the axial position of the housing. The sleeve is equipped with a rotation component and a drive component. The drive component is used to drive the sleeve to drive the drill rod to rotate circumferentially along the sleeve. The drive assembly includes a gear ring and multiple drive gears mounted inside the housing, and a driven gear disposed on the sleeve. The drive gears mesh with the driven gears and the gear ring respectively.

6. The power head according to claim 5, characterized in that, Along the circumference of the sleeve, the inner wall of the sleeve is provided with a plurality of key bars, which extend along the axial direction of the sleeve; The key bar includes a plurality of first key bars and a plurality of second key bars. The plurality of first key bars are fixedly connected to the sleeve, and the plurality of second key bars are detachably connected to the sleeve. The first key bars are located between two adjacent second key bars.

7. The power head according to claim 6, characterized in that, One end of the second key bar is provided with an L-shaped limiting member, and the limiting member is provided with a plurality of threaded holes, which are arranged at intervals along the extension direction of the limiting member; The limiting member and the second key bar have a groove. In the assembled state, the end of the sleeve is engaged in the groove. The power box transmits torque and pressure through the cooperation between the key bar and the drill rod.

8. The power head according to claim 7, characterized in that, The hydraulic system is a hydraulic motor, and a speed reducer is provided on the top of the housing near the hydraulic motor. The speed reducer is used to control the rotational speed and torque transmission of the power head.

9. The power head according to claim 1, characterized in that, The buffer device includes a buffer pressure plate, multiple spring assemblies, and a shock-absorbing chassis, wherein the multiple spring assemblies are located between the buffer pressure plate and the shock-absorbing chassis and are spaced apart along the circumference of the buffer pressure plate.

10. A rotary drilling rig, characterized in that, It includes a drilling rig body, a mast mounted on the drilling rig body, a drill rod and a drill string at one end of the drill rod, and a power head as described in any one of claims 1-9; The power head is mounted on the mast.

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