Multi-channel drill rod

Abstract

The invention discloses a multi-channel drill rod which comprises an outer pipe, a central hydraulic pipe, an outer hydraulic pipe, a front fixing seat and a rear fixing seat. Male threads and female threads are arranged at two ends of the outer pipe and are used for connecting a plurality of drill rods in series; the center hydraulic pipe and the outer hydraulic pipe provide a main hydraulic channel and an additional hydraulic channel correspondingly, and butt joint structures are arranged at the two ends to achieve communication of the hydraulic channels. The front fixing base and the rear fixing base fix the hydraulic pipe and support the hydraulic pipe to rotate and move. The front fixing seat is provided with a threaded hole matched with the outer hydraulic pipe, and the threaded hole is matched with the positioning block and the pin hole to ensure accurate butt joint of the hydraulic pipe. Anchoring, propelling, rotary cutting and cooling functions of traction type drilling are supported through multiple hydraulic channels, friction damping and energy consumption are reduced, the equipment structure is optimized, the device adapts to narrow space and large-aperture drilling, operation is easy and convenient, sealing is reliable, the construction cost is remarkably reduced, and technical support is provided for green mining.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling equipment, in particular to a multi-channel drill rod, which is particularly suitable for realizing traction-type drilling with multiple hydraulic channels connected. Background Art

[0002] In existing drilling technology, drill pipes typically utilize a single-channel design, primarily for the circulation of coolant or directional drilling fluid, enabling push-type drilling using multiple drill pipes. There are two main drilling modes: one in which the drill pipe rotates to drive the drill bit for bottom-of-hole cutting, and the other in which a bottom-of-hole motor drives the drill bit for rotary cutting. During drilling, the drill pipe must not only withstand the torque of rotary cutting but also provide propulsion, resulting in a slender rod operation. However, since slender rods are prone to bending under axial compression, the frictional resistance between the drill pipe and the hole wall increases significantly. This not only increases energy consumption but also places higher demands on drilling equipment, resulting in larger and heavier equipment, making operation more difficult, especially when operating in confined spaces. Furthermore, the single-channel design of traditional drill pipes makes it difficult to meet the multiple functions required for remote traction drilling, such as anchoring, propulsion, rotary cutting, and cooling. This results in low drilling efficiency and significant energy waste.

[0003] To address these issues, towed drilling has been proposed as a new drilling method. Towed drilling requires remotely performing multiple functions, including rotary cutting, propulsion, anchoring, and cooling. This requires the use of multi-channel drill pipes to provide multiple hydraulic channels, thus providing power support for remote cutting, propulsion, anchoring, and cooling. This design effectively reduces the energy loss caused by overcoming frictional damping in traditional drilling, optimizes the spatial layout of drilling equipment, reduces its size and weight, and adapts to the needs of working in confined spaces. It also lays the foundation for large-diameter drilling and green mining.

[0004] Therefore, developing a multi-channel drill pipe that can achieve reliable connectivity of multiple hydraulic channels under the connection of multiple drill pipes, while ensuring the sealing and docking accuracy of the hydraulic channels, reducing friction damping and energy consumption, and optimizing the drilling equipment structure has become an urgent need for the development of drilling technology. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to solve the above problems and proposes a multi-channel drill pipe. By arranging a central hydraulic pipe and multiple outer hydraulic pipes in the outer pipe, and using the front fixed seat and the rear fixed seat to realize the connection of multiple hydraulic channels, it supports multiple functions such as remote self-anchoring, propulsion, and drilling. The drill pipe works under tensile stress, providing technical support for green mining and large-diameter drilling.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A multi-channel drill pipe, comprising:

[0008] The outer tube has male and female threads at both ends, which are used to connect and fix multiple drill pipes in series;

[0009] A central hydraulic pipe is provided at the center of the outer pipe and is used to provide a hydraulic channel;

[0010] An external hydraulic pipe is provided outside the central hydraulic pipe to provide an additional hydraulic channel;

[0011] Both ends of the central hydraulic pipe and the outer hydraulic pipe are provided with docking structures for serial expansion of the hydraulic channel;

[0012] The outer tube is also provided with a front fixing seat and a rear fixing seat located at the front and rear ends of the outer tube respectively, which are used to install and fix the central hydraulic pipe and the outer hydraulic pipe. The central hydraulic pipe and the outer hydraulic pipe can both rotate and move back and forth in the front fixing seat and the rear fixing seat to achieve the connection of multiple hydraulic channels when multiple drill rods are connected.

[0013] Furthermore, pin holes are provided at both ends of the outer tube, and the front fixing seat and the rear fixing seat are respectively fixed in the outer tube by cooperating with the pin holes through the pin shafts on the side walls; the phase angles of the male thread and female thread of the outer tube and the pin holes are relatively fixed, ensuring that the external hydraulic tubes correspond one to one when adjacent drill rods are connected.

[0014] Furthermore, the front fixing seat and the rear fixing seat are each provided with a plurality of circumferentially distributed external hydraulic pipe mounting holes, and a positioning block is respectively provided at one end of the front fixing seat and the rear fixing seat facing away from each other; the phase angles of the positioning block and the external hydraulic pipe mounting hole are relatively fixed, and the height of the positioning block along the axial direction of the drill rod does not exceed the pitch value of the male and female threads on the external pipe; when multiple drill rods are connected, the side surfaces of the positioning blocks between adjacent front fixing seats and rear fixing seats are in contact so that the external hydraulic pipe mounting holes correspond one to one.

[0015] Furthermore, a central hydraulic pipe mounting hole is provided on both the front fixing seat and the rear fixing seat; a front fixing seat step and a rear fixing step are provided at both ends of the outer wall of the central hydraulic pipe, and the front fixing seat step and the rear fixing step respectively correspond to the central hydraulic pipe mounting holes on the front fixing seat and the rear fixing seat respectively, and a sealing groove is provided at one end of the front fixing seat step extending out of the front fixing seat, and a sealing ring is provided in the sealing groove;

[0016] The rear end of the inner hole of the central hydraulic pipe is provided with a sealing inner hole and a polygonal hole for bearing the rotational torque in sequence; the sealing inner hole is used for inserting the front end of the central hydraulic pipe of the rear drill rod when the drill rods are connected in series, and cooperates with the sealing ring to realize the sealed connection of the hydraulic channel;

[0017] The polygonal hole is used to achieve the docking of the central hydraulic pipes of adjacent drill rods under the action of rotational power.

[0018] Furthermore, the external hydraulic pipe mounting hole on the front fixing seat is provided with a thread; the outer wall end of the external hydraulic pipe corresponding to the front fixing seat is provided with a connecting thread, and the outer wall end of the external hydraulic pipe corresponding to the rear fixing seat is provided with a rear fixing step; the connecting thread is matched with the thread on the external hydraulic pipe mounting hole of the front fixing seat, and the rear fixing step on the external hydraulic pipe is arranged in the external hydraulic pipe mounting hole on the rear fixing seat; the front end of the connecting thread of the external hydraulic pipe is provided with a sealing groove, and a sealing ring is provided in the sealing groove;

[0019] The rear end of the inner hole of the outer hydraulic pipe is provided with a sealing inner hole and a polygonal hole for bearing the rotational torque in sequence; the sealing inner hole is used for inserting the front end of the outer hydraulic pipe of the rear drill rod when the drill rods are connected in series, and cooperates with the sealing ring to realize the sealed connection of the hydraulic channel;

[0020] The polygonal hole is used to achieve the docking of the outer hydraulic pipes of adjacent drill rods under the action of rotational power.

[0021] Furthermore, the outer hydraulic pipe is provided with one or more inner portions thereof.

[0022] Furthermore, pin holes are also provided on the outer walls of the front fixing seat and the rear fixing seat for installing pin shafts.

[0023] Furthermore, during the drill pipe connection process, the following steps are performed to achieve the connectivity of multiple hydraulic channels:

[0024] (1) Reverse the polygonal hole in the outer hydraulic pipe to ensure that the end surface of the outer hydraulic pipe is no higher than the end surface of the front fixed seat;

[0025] (2) Place the multi-channel drill rod in the space between the power head and the front drill rod;

[0026] (3) Clamp the tail end of the multi-channel drill pipe by a chuck;

[0027] (4) The power head is pushed forward and rotated, so that the front end of the multi-channel drill pipe is screwed to the front drill pipe through the male and female threads;

[0028] (5) The positioning blocks on the front and rear fixing seats of adjacent drill pipes stop rotating after the sides contact each other;

[0029] (6) Start the multi-tube rotating device of the power head and connect the multi-tube of the power head with the external hydraulic pipe and the central hydraulic pipe to provide a power source.

[0030] Furthermore, during the drill pipe disassembly process, the multiple hydraulic channels are disconnected by the following steps:

[0031] (1) Start the multi-tube rotating device of the power head, so that the external hydraulic pipe rotates in the reverse direction through the internal polygonal hole, and the external hydraulic pipe withdraws from the front fixed seat, disconnecting the external hydraulic pipe from the front drill pipe;

[0032] (2) Reverse the outer tube and unscrew it from the front drill pipe through the male and female threads.

[0033] The beneficial effects of the present invention are:

[0034] The present invention provides a multi-channel drill pipe. By disposing a central hydraulic pipe and an outer hydraulic pipe within an outer pipe and utilizing front and rear mountings to connect multiple hydraulic channels, this invention meets the requirements for multiple functions such as anchoring, propulsion, rotary cutting, and cooling during remote traction drilling. Compared to traditional single-channel drill pipes, this invention offers significant advantages in many aspects. The following details its beneficial effects:

[0035] 1. Realize the connection of multiple hydraulic channels and improve the traction drilling function

[0036] The multi-channel drill pipe of the present invention realizes the reliable connection of multiple hydraulic channels when multiple drill pipes are connected through the docking structure design of the central hydraulic pipe and the external hydraulic pipe. The central hydraulic pipe provides the main hydraulic channel, and the external hydraulic pipe (one or more) provides additional hydraulic channels to support the various functions required for remote traction drilling, such as anchoring, propulsion, rotary cutting and cooling. Compared with the traditional single-channel drill pipe that can only transmit coolant or a single power fluid, the present invention can transmit multiple hydraulic powers at the same time, significantly improving the versatility and adaptability of the drilling system. This design solves the limitation that traditional drill pipes cannot meet the complex functional requirements of traction drilling, and provides technical support for deep hole drilling and large-diameter drilling.

[0037] 2. Optimize the structure of drilling equipment to adapt to operations in narrow spaces

[0038] The multi-channel drill pipe of this invention optimizes the overall layout of the drill pipe through the rational design of the outer pipe, front and rear mountings, and hydraulic pipes. The fixed phase angle design of the outer pipe's male and female threads and the pin holes, combined with the positioning blocks of the front and rear mountings, ensures a one-to-one correspondence between the hydraulic pipes when connecting adjacent drill pipes, simplifying the connection process. The outer pipe fixing threaded holes in the front mounting mate with the connecting threads of the external hydraulic pipe, while the rear mounting is threadless, further reducing structural complexity and the weight and volume of the drill pipe.

[0039] 3. Easy to operate and improve construction efficiency

[0040] The multi-channel drill pipe of this invention achieves rapid connection and disconnection of multiple hydraulic channels through clear connection and disconnection procedures, combined with a multi-tube rotating device in the power head. During connection, the outer hydraulic tube rotates reversely through the polygonal hole to adjust the end face position, which, combined with the precise positioning of the positioning block, simplifies the connection operation. During disconnection, the hydraulic channels can be quickly disconnected by reverse rotation. The entire process does not require complex tools or additional adjustments, significantly reducing operation time. This efficient connection and disconnection method significantly improves construction efficiency and is particularly suitable for deep-hole drilling operations that require frequent connection and disconnection.

[0041] 4. Wide applicability, supporting large-diameter drilling

[0042] The multi-channel drill pipe of this invention features a flexible design with one or more external hydraulic pipes, allowing the number of hydraulic channels to be adjusted according to different drilling requirements, adapting to a variety of working conditions. Whether it's small-diameter exploratory drilling or large-diameter engineering drilling, this invention provides stable hydraulic power support. Its versatility and high reliability make it suitable for a variety of scenarios, including geological exploration, mining, and tunnel construction, laying a solid foundation for the development of large-diameter drilling technology.

[0043] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0045] Figure 1 It is an overall schematic diagram of the multi-channel drill pipe in the present invention.

[0046] Figure 2 It is a side view of the multi-channel drill pipe in the present invention.

[0047] Figure 3 for Figure 2 CC section view in.

[0048] Figure 4 Schematic diagram of the outer tube in the present invention.

[0049] Figure 5 、 6 It is a schematic diagram of the rear fixed seat structure.

[0050] Figure 7 、 8 , 9 are schematic diagrams of the central hydraulic pipe structure.

[0051] Figure 10 、 11 , 12 are schematic diagrams of the external hydraulic pipe structure.

[0052] Figure 13 、 14 15 is a schematic diagram of the front fixed seat structure.

[0053] Figure markings: 1-outer tube; 11-female thread; 12-pin hole; 13-male thread; 2-rear fixing seat; 21-external hydraulic pipe mounting hole; 22-center hydraulic pipe mounting hole; 23-pin hole; 24-positioning block; 3-center hydraulic pipe; 31-sealed inner hole; 32-rear fixing step; 33-polygonal hole; 34-inner hole; 35-front fixing seat step; 36-sealing groove; 4-outer hydraulic pipe; 41-sealed inner hole; 42-polygonal hole; 43-rear fixing seat step; 44-inner hole; 45-connecting thread; 46-sealing groove; 5-front fixing seat; 51-external hydraulic pipe mounting hole; 52-outer tube fixing threaded hole; 53-center hydraulic pipe mounting hole; 54-pin hole; 55-positioning block; 6-pin shaft; 7-sealing ring. DETAILED DESCRIPTION

[0054] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0055] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0056] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0057] like Figures 1 to 15 As shown, the multi-channel drill pipe of the present invention includes an outer tube 1, a central hydraulic tube 3, multiple outer hydraulic tubes 4, a front fixing seat 5, a rear fixing seat 2, a pin 6 and a sealing ring 7.

[0058] The outer tube 1 is the main body of the drill pipe and provides support. It is equipped with female threads 11 and male threads 13 at each end, respectively, for connecting and securing multiple drill pipes. Pin holes 12 are also provided at both ends of the outer tube 1. The phase angles of the male threads 13, female threads 11, and pin holes 12 are fixed relative to each other, ensuring a one-to-one correspondence between the outer hydraulic tubes 4 when adjacent drill pipes are connected.

[0059] The rear fixing base 2 is secured to the pin hole 12 of the outer tube 1 via a pin 6. Pin holes 23 are provided on the sidewalls for receiving the pin 6. A central hydraulic pipe mounting hole 22 is located in the center of the rear fixing base 2. Multiple, circumferentially distributed external hydraulic pipe mounting holes 21 surround this hole, securing and guiding the external hydraulic pipes 4 and 3. These holes are threadless. A positioning block 24 is located at the end of the rear fixing base 2 facing away from the front fixing base 5. The height of the positioning block 24 does not exceed the thread pitch of the outer tube 1. The positioning block 24 is aligned at a fixed angle with the external hydraulic pipe mounting hole 21, ensuring precise positioning when connecting adjacent drill pipes.

[0060] The central hydraulic pipe 3 is positioned at the center of the outer pipe 1. Its outer wall is provided with a front fixing step 35 and a rear fixing step 32 at each end, which mate with the central hydraulic pipe mounting hole 53 in the front fixing seat 5 and the central hydraulic pipe mounting hole 22 in the rear fixing seat 2, respectively. A sealing inner hole 31 and a polygonal hole 33 are sequentially provided at the rear end of the inner bore 34 of the central hydraulic pipe 3. A sealing groove 36 is provided at the front end of the front fixing step 35, which houses a sealing ring 7. The sealing inner hole 31 is used to insert the front end of the central hydraulic pipe 3 of the rear drill rod and cooperates with the sealing ring 7 to achieve a sealed connection. The polygonal hole 33 is used to connect the central hydraulic pipe 3 under the action of rotary power.

[0061] The external hydraulic pipe 4 is installed outside the central hydraulic pipe 3. One or more external hydraulic pipes 4 can be installed inside the external pipe 1. The outer wall end of the external hydraulic pipe 4 corresponding to the front fixing seat is provided with a connecting thread 45, and the outer wall end corresponding to the rear fixing seat is provided with a rear fixing seat step 43. The connecting thread 45 mates with the thread at the front end of the external hydraulic pipe mounting hole 51 of the front fixing seat 5, and the rear fixing seat step 43 is located within the external hydraulic pipe mounting hole 21 of the rear fixing seat 2. The rear end of the inner bore 44 of the external hydraulic pipe 4 is provided with a sealing inner bore 41 and a polygonal hole 42 in sequence. The front end is provided with a sealing groove 46, and the sealing groove 46 is provided with a sealing ring 7. The sealing inner bore 41 is used to insert the front end of the external hydraulic pipe 4 of the rear drill rod and cooperates with the sealing ring 7 to achieve a sealed connection. The polygonal hole 42 is used to connect the external hydraulic pipe 4 under the action of rotational power.

[0062] The front fixing base 5 is secured to the pin hole 12 of the outer tube 1 via a pin 6. A pin hole 54 is provided on the side wall for mounting the pin 6. The front fixing base 5 is provided with multiple circumferentially distributed external hydraulic pipe mounting holes 51 and a central hydraulic pipe mounting hole 53. Threaded holes 52 for securing the external hydraulic pipe are located at the front ends of the external hydraulic pipe mounting holes 51. These holes 52 mate with the connecting threads 45 of the external hydraulic pipe 4 for securing. A positioning block 55 is provided at the end of the front fixing base 5 facing away from the rear fixing base 2. The height of the positioning block 55 does not exceed the thread pitch of the outer tube 1. The positioning block 55 is aligned at a fixed angle with the external hydraulic pipe mounting hole 51, ensuring precise positioning when connecting adjacent drill pipes.

[0063] The multi-channel drill pipe of the present invention realizes the connection and disconnection of multiple hydraulic channels through the following steps:

[0064] 1. Drill pipe connection

[0065] (1) The polygonal hole 42 in the outer hydraulic pipe 4 is reversely rotated so that the end surface of the outer hydraulic pipe 4 is not higher than the end surface of the front fixing seat 5, thereby avoiding connection interference.

[0066] (2) Place the multi-channel drill rod in the space between the power head and the front drill rod.

[0067] (3) Clamp the tail end of the drill pipe (the end with female thread 11) by the chuck.

[0068] (4) The power head is pushed forward and rotated, so that the male thread 13 at the front end of the drill rod is screwed into the female thread 11 of the front drill rod.

[0069] (5) The positioning blocks 55 and 24 of the front fixing seat 5 and the rear fixing seat 2 of the adjacent drill rods stop rotating after the sides contact each other, ensuring that the external hydraulic pipe mounting holes 51 and 21 correspond one to one.

[0070] (6) Start the multi-tube rotating device of the power head and connect the multi-tubes of the power head with the outer hydraulic pipe 4 and the central hydraulic pipe 3 through the polygonal holes 33 and 42 to provide anchoring, propulsion, rotary cutting and cooling power.

[0071] 2. Drill pipe disassembly

[0072] (1) Start the multi-tube rotating device of the power head, so that the outer hydraulic pipe 4 rotates in the reverse direction through the polygonal hole 42, withdraws from the outer hydraulic pipe mounting hole 51 of the front fixing seat 5, and disconnects the outer hydraulic pipe 4 from the front drill rod.

[0073] (2) Reverse the outer tube 1 and unscrew it from the front drill rod through the male thread 13 and the female thread 11 to complete the disassembly.

[0074] The multi-channel drill pipe of the present invention utilizes multiple hydraulic channels to achieve anchoring, propulsion, rotary cutting, and cooling functions for remote traction drilling. This reduces frictional resistance, energy consumption, and optimizes equipment size and weight, making it suitable for drilling in confined spaces and large apertures. The sealing ring 7 and docking structure ensure the sealing and reliability of the hydraulic channels, providing technical support for green mining.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A multi-channel drill pipe, characterized in that: include: The outer tube has male and female threads at both ends, which are used to connect and fix multiple drill pipes in series; A central hydraulic pipe is provided at the center of the outer pipe and is used to provide a hydraulic channel; An external hydraulic pipe is provided outside the central hydraulic pipe to provide an additional hydraulic channel; Both ends of the central hydraulic pipe and the outer hydraulic pipe are provided with docking structures for serial expansion of the hydraulic channel; The outer tube is also provided with a front fixing seat and a rear fixing seat located at the front and rear ends of the outer tube respectively, which are used to install and fix the central hydraulic pipe and the outer hydraulic pipe. The central hydraulic pipe and the outer hydraulic pipe can both rotate and move back and forth in the front fixing seat and the rear fixing seat to achieve the connection of multiple hydraulic channels when multiple drill rods are connected.

2. The multi-channel drill pipe according to claim 1, characterized in that: Pin holes are provided at both ends of the outer tube, and the front fixing seat and the rear fixing seat are respectively matched with the pin holes through the pin shafts on the side walls and fixed in the outer tube; the phase angles of the male and female threads of the outer tube and the pin holes are relatively fixed to ensure that the outer hydraulic tubes correspond one to one when adjacent drill rods are connected.

3. The multi-channel drill pipe according to claim 2, characterized in that: The front fixing seat and the rear fixing seat are each provided with a plurality of circumferentially distributed external hydraulic pipe mounting holes, and a positioning block is respectively provided at one end of the front fixing seat and the rear fixing seat which are away from each other; the phase angles of the positioning block and the external hydraulic pipe mounting hole are relatively fixed, and the height of the positioning block along the axial direction of the drill rod does not exceed the pitch value of the male and female threads on the external pipe; when multiple drill rods are connected, the side surfaces of the positioning blocks between adjacent front fixing seats and rear fixing seats are in contact so that the external hydraulic pipe mounting holes correspond one to one.

4. The multi-channel drill pipe according to claim 3, characterized in that: The front fixing seat and the rear fixing seat are both provided with a central hydraulic pipe mounting hole; the outer wall of the central hydraulic pipe is provided with a front fixing seat step and a rear fixing step at both ends, and the front fixing seat step and the rear fixing step respectively correspond to the central hydraulic pipe mounting holes on the front fixing seat and the rear fixing seat respectively. The end of the front fixing seat step extending out of the front fixing seat is provided with a sealing groove, and a sealing ring is provided in the sealing groove; The rear end of the inner hole of the central hydraulic pipe is provided with a sealing inner hole and a polygonal hole for bearing the rotational torque in sequence; the sealing inner hole is used for inserting the front end of the central hydraulic pipe of the rear drill rod when the drill rods are connected in series, and cooperates with the sealing ring to realize the sealed connection of the hydraulic channel; The polygonal hole is used to achieve the docking of the central hydraulic pipes of adjacent drill rods under the action of rotational power.

5. The multi-channel drill pipe according to claim 3, characterized in that: The external hydraulic pipe mounting hole on the front fixing seat is provided with a thread; the outer wall end of the external hydraulic pipe corresponding to the front fixing seat is provided with a connecting thread, and the outer wall end of the external hydraulic pipe corresponding to the rear fixing seat is provided with a rear fixing step; the connecting thread is matched with the thread on the external hydraulic pipe mounting hole of the front fixing seat, and the rear fixing step on the external hydraulic pipe is arranged in the external hydraulic pipe mounting hole on the rear fixing seat; the front end of the connecting thread of the external hydraulic pipe is provided with a sealing groove, and a sealing ring is provided in the sealing groove; The rear end of the inner hole of the outer hydraulic pipe is provided with a sealing inner hole and a polygonal hole for bearing the rotational torque in sequence; the sealing inner hole is used for inserting the front end of the outer hydraulic pipe of the rear drill rod when the drill rods are connected in series, and cooperates with the sealing ring to realize the sealed connection of the hydraulic channel; The polygonal hole is used to achieve the docking of the outer hydraulic pipes of adjacent drill rods under the action of rotational power.

6. The multi-channel drill pipe according to claim 3, characterized in that: The outer hydraulic pipe is provided with one or more inner portions of the outer pipe.

7. The multi-channel drill pipe according to claim 2, characterized in that: Pin holes are also provided on the outer walls of the front fixing seat and the rear fixing seat for installing pin shafts.

8. The multi-channel drill pipe according to any one of claims 1 to 7, characterized in that: During the drill pipe connection process, the following steps are performed to connect multiple hydraulic channels: (1) Reverse the polygonal hole in the outer hydraulic pipe to ensure that the end surface of the outer hydraulic pipe is no higher than the end surface of the front fixed seat; (2) Place the multi-channel drill rod in the space between the power head and the front drill rod; (3) Clamp the tail end of the multi-channel drill pipe by a chuck; (4) The power head is pushed forward and rotated, so that the front end of the multi-channel drill pipe is screwed to the front drill pipe through the male and female threads; (5) The positioning blocks on the front and rear fixing seats of adjacent drill pipes stop rotating after the sides contact each other; (6) Start the multi-tube rotating device of the power head and connect the multi-tube of the power head with the external hydraulic pipe and the central hydraulic pipe to provide a power source.

9. The multi-channel drill pipe according to any one of claims 1 to 7, characterized in that: During the drill pipe removal process, the multiple hydraulic channels are disconnected by the following steps: (1) Start the multi-tube rotating device of the power head, so that the external hydraulic pipe rotates in the reverse direction through the internal polygonal hole, and the external hydraulic pipe withdraws from the front fixed seat, disconnecting the external hydraulic pipe from the front drill pipe; (2) Reverse the outer tube and unscrew it from the front drill pipe through the male and female threads.

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