A geological drilling reamer

Abstract

This utility model discloses a geological drilling reamer, including a head assembly, an outer tube, an inner tube, a locator, a retaining ring, and a drill bit. The head assembly has a first thread on its fixed end and a second thread on its inner rotating shaft. The head assembly is threaded to the inner tube via the second thread and to the outer tube via the first thread. The reamer also includes: a short-connection structure, one end of which is threaded to the inner tube for fixing the inner tube to the locator; an inner wall compaction support structure, one end of which is threaded to the outer tube for compacting the borehole wall after reaming to prevent collapse; and a modular reaming structure, one end of which is threaded to the inner wall compaction support structure. The modular design of this reamer allows for gradual enlargement of the borehole diameter as needed, enabling the selection of a small-diameter initial drill bit, reducing the risk of stuck drill bit and alleviating drill rod pressure. The modular structure facilitates rapid adjustment and assembly, reducing equipment replacement costs and improving construction flexibility and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of borehole reamer technology, specifically to a geological drilling borehole reamer. Background Technology

[0002] In the field of geological exploration, borehole reamers are one of the key tools. Their main function is to further enlarge the borehole diameter after the initial drilling by the drill bit, in order to meet the needs of subsequent operations such as sampling, casing installation, or monitoring equipment installation. Through rotational cutting and extrusion, the reamer uniformly widens the borehole wall to the target size, ensuring the verticality and smoothness of the hole, significantly improving drilling efficiency and quality. It is an indispensable piece of equipment in geological exploration operations.

[0003] However, traditional reamers have many problems. On the one hand, when using large-diameter reamers, the large contact area with the borehole wall makes them prone to jamming due to variations in the hardness of complex formations, leading to equipment damage and work interruptions. On the other hand, the excessive torque and axial pressure applied to the drill pipe by large-diameter drill bits can easily cause fatigue fracture of the drill pipe, reducing equipment lifespan. Furthermore, in unstable formations, traditional reaming methods struggle to compact the borehole wall, easily leading to borehole wall collapse and affecting drilling quality and efficiency. These problems limit the effectiveness of traditional reamers in complex geological conditions, hence this geological drilling reamer is proposed. Utility Model Content

[0004] To address the problems of traditional borehole reamers, such as easy drill bit jamming, excessive drill rod pressure, and insufficient borehole wall stability under complex geological conditions, this utility model provides a geological drilling reamer.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] A geological drilling reamer includes a head assembly, an outer tube, an inner tube, a retainer, a retaining ring, and a drill bit. A first thread is formed on the fixed end of the head assembly's outer shell, and a second thread is formed on the rotating shaft inside the head assembly. The head assembly is threadedly connected to the inner tube via the second thread, and to the outer tube via the first thread. The drilling reamer also includes:

[0007] The short-connection structure has one end threaded to the inner tube, which is used to fix the inner tube to the card seat.

[0008] The inner wall compaction support structure is connected to the outer pipe thread at one end and is used to compact the hole wall after the hole is enlarged to prevent the hole wall from collapsing.

[0009] The modular enlargement structure has one end threadedly connected to the inner wall compaction support structure and the other end threadedly connected to the drill bit, used to widen the diameter of the hole drilled by the drill bit.

[0010] Preferably, one end of the outer tube has an internal thread and the other end has an external thread. The head assembly is threaded to the end of the outer tube with the internal thread via a first thread, and both ends of the inner tube have internal threads.

[0011] Preferably, the short-circuit connection structure includes:

[0012] The first short connector is threaded to the end of the inner tube furthest from the head assembly;

[0013] The second short connector is threaded to the end of the first short connector furthest from the head assembly.

[0014] Preferably, the first short connecting pipe includes:

[0015] The first connector and the first pipe body are integrally formed. The first connector has an external thread, and the first pipe body has an internal thread. The first short pipe is connected to the internal pipe thread through the first connector.

[0016] The connector hole is located on the first pipe body.

[0017] Preferably, the second short connector includes:

[0018] The second connector and the second pipe body are integrally formed. The second connector has an external thread. The second short pipe is threaded to the first pipe body on the first short pipe through the second connector. The second pipe body has a slot.

[0019] Preferably, the inner wall compaction support structure includes:

[0020] The compactor is connected to the outer pipe thread at one end. The compactor consists of a compaction pipe body, a compaction joint, and a rotating inner bushing. The compaction pipe body and the compaction joint are integrally formed. The compaction joint is fixedly installed at both ends of the compaction pipe body and has an internal thread. The rotating inner bushing is rotatably installed on the inner ring of the compaction pipe body.

[0021] Preferably, the compacted tube body comprises:

[0022] A sealing and limiting groove is formed in the inner ring of the compacted pipe body;

[0023] The piston hole is located inside the compaction tube body, and one end of the piston hole communicates with the inner ring of the compaction tube body.

[0024] The storage grooves are distributed in a circular pattern on the outer ring of the compaction tube body, and the storage grooves are connected to the piston hole at the end away from the inner ring of the compaction tube body.

[0025] The piston rod and the compaction plate are fixedly connected. The piston rod is slidably installed in the piston hole, and the compaction plate is slidably installed in the storage groove. The upper and lower sides of the compaction plate away from the piston rod have chamfers.

[0026] Preferably, the rotating inner bushing includes:

[0027] The limiting protrusion is fixedly installed on the outer ring of the rotating inner bushing, and the limiting protrusion is rotatably installed in the sealing limiting groove;

[0028] The sealing ring is installed in the sealing limiting groove and is located below the limiting protrusion;

[0029] An air groove is formed on the outer ring of the rotating inner bushing and located between two limiting protrusions;

[0030] The air intake connector is threaded onto the inner ring of the rotating inner bushing and is connected to the air groove. The air intake connector passes through the slot.

[0031] Preferably, the module combination enlargement structure includes:

[0032] Modular drill bits consist of a modular connector, a diamond drill bit, and a drill bit body, all integrally formed. The modular connector is fixedly installed at both ends of the drill bit body. One end of the modular connector has an external thread, and the other end has an internal thread. The externally threaded end of the modular connector is threadedly connected to the compaction joint, and the internally threaded end of the modular connector is threadedly connected to the drill bit.

[0033] The beneficial effects of this utility model are as follows:

[0034] (i) The modular design of this reamer allows for gradual enlargement of the borehole diameter as needed, enabling the selection of a small-diameter initial drill bit, reducing the risk of stuck drill bit and alleviating drill rod pressure. The modular structure facilitates rapid adjustment and assembly, reducing equipment replacement costs and improving construction flexibility and efficiency.

[0035] (II) This utility model utilizes an internal wall compaction support structure to periodically press a compaction plate against the borehole wall using air pressure, effectively compacting the borehole wall and preventing collapse. Especially in unstable strata, this design significantly improves borehole wall stability, reduces the risk of drilling interruption and equipment damage, and ensures operational continuity.

[0036] (III) The short-connection structure of this utility model ensures a stable connection between the inner tube and the card holder through a threaded connection, and precisely aligns the air passage interface. This design enables the components to maintain reliable connection even under complex working conditions. The short-connection structure allows the card holder to connect to the inner tube, which is equipped with multiple expanders and an inner wall compaction support structure. Attached Figure Description

[0037] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0038] Figure 2 This is a schematic cross-sectional view of the present invention;

[0039] Figure 3 This is a schematic diagram of the cross-sectional structure of the head assembly and the outer and inner tubes of this utility model;

[0040] Figure 4 This is a cross-sectional structural diagram of the connection between the outer tube and the inner wall compaction support structure and the module combination expansion structure of this utility model;

[0041] Figure 5 This is a cross-sectional structural diagram of the inner tube and the short-connection structure and the card seat of this utility model.

[0042] Figure 6 This is a cross-sectional structural diagram of the inner wall compaction support structure of this utility model;

[0043] Figure 7 This is a cross-sectional structural diagram of the inner wall compaction support structure of this utility model;

[0044] Figure 8 This is a half-sectional structural diagram of the modular drill bit of this utility model;

[0045] Figure 9 This is an exploded schematic diagram of the compactor part of this utility model.

[0046] Reference numerals: 1. Head assembly; 2. Outer tube; 3. Inner tube; 4. Short-connection structure; 40. First short-connection tube; 401. First connector; 402. First tube body; 403. Connector hole; 41. Second short-connection tube; 410. Second connector; 411. Second tube body; 412. Slot; 5. Inner wall compaction support structure; 50. Compactor; 51. Compactor tube body; 510. Piston hole; 511. Piston column; 512. Compactor Plate; 513, Storage groove; 514, Sealing and limiting groove; 52, Compacting joint; 53, Rotating inner bushing; 530, Limiting protrusion; 531, Sealing ring; 532, Air groove; 533, Air inlet joint; 6, Modular combination reaming structure; 60, Modular drill bit; 601, Module connector; 602, Diamond drill bit; 603, Drill bit body; 7, First thread; 8, Second thread; 9, Socket; 10, Snap ring; 11, Drill bit. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0049] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0050] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that can control it.

[0051] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0052] Example 1: Refer to Figures 1-9 A geological drilling reamer includes a head assembly 1, an outer tube 2, an inner tube 3, a retainer 9, a retaining ring 10, and a drill bit 11. The fixed end of the outer shell of the head assembly 1 has a first thread 7, and the rotating shaft inside the head assembly 1 has a second thread 8. The head assembly 1 is threaded to the inner tube 3 via the second thread 8, and the head assembly 1 is threaded to the outer tube 2 via the first thread 7. One end of the outer tube 2 has an internal thread, and the other end has an external thread. The head assembly 1 is threaded to the internally threaded end of the outer tube 2 via the first thread 7. Both ends of the inner tube 3 have internal threads. To design a drilling reamer that can compact the borehole wall during reaming and allows for modular assembly, the drilling reamer also includes:

[0053] The short-connection structure 4 has one end threadedly connected to the inner tube 3, which is used to fix the inner tube 3 to the card seat 9.

[0054] The inner wall compaction support structure 5 is threaded to the outer tube 2 at one end, and is used to compact the hole wall after the hole is enlarged to prevent the hole wall from collapsing.

[0055] The modular combination hole-enlarging structure 6 is threaded to the inner wall compaction support structure 5 at one end and threaded to the drill bit 11 at the other end, and is used to widen the hole diameter drilled by the drill bit 11.

[0056] To prevent the inner wall of the borehole from collapsing during the excavation of the device, the inner wall compaction support structure 5 includes: a compactor 50, one end of which is threadedly connected to the outer pipe 2. The compactor 50 consists of a compaction pipe body 51, a compaction joint 52, and a rotating inner bushing 53. The compaction pipe body 51 and the compaction joint 52 are integrally formed. The compaction joint 52 is fixedly installed at both ends of the compaction pipe body 51 and has an internal thread. The rotating inner bushing 53 is rotatably installed on the inner ring of the compaction pipe body 51. The compaction pipe body 51 includes: a sealing and limiting groove 514, which is opened in the inner ring of the compaction pipe body 51; a piston hole 510, which is opened in the compaction pipe body 51 and one end of the piston hole 510 communicates with the inner ring of the compaction pipe body 51; and a receiving groove 513, which is circumferentially distributed on the outer ring of the compaction pipe body 51 and communicates with the end of the piston hole 510 away from the inner ring of the compaction pipe body 51. The piston rod 511 and the compaction plate 512 are fixedly connected. The piston rod 511 is slidably installed in the piston hole 510, and the compaction plate 512 is slidably installed in the receiving groove 513. The upper and lower sides of the compaction plate 512 away from the piston rod 511 are chamfered. The rotating inner bushing 53 includes: a limiting protrusion 530, which is fixedly installed on the outer ring of the rotating inner bushing 53 and rotatably installed in the sealing limiting groove 514; a sealing ring 531, which is installed in the sealing limiting groove 514 and located below the limiting protrusion 530; an air groove 532, which is opened on the outer ring of the rotating inner bushing 53 and located between the two limiting protrusions 530; and an air inlet connector 533, which is threaded on the inner ring of the rotating inner bushing 53 and communicates with the air groove 532. The air inlet connector 533 passes through the slot 412.

[0057] During installation, first connect the head assembly 1 to the inner tube 3 via the second thread 8 and tighten it. Then, insert the inner tube 3 into the outer tube 2. Next, connect the head assembly 1 to the outer tube 2 via the first thread 7 and tighten it. Connect the compactor 50 to the end of the outer tube 2 away from the head assembly 1 via the compaction connector 52. Through the precise design of the threads, after the compactor 50 is tightened, the opening of the air inlet connector 533 should be aligned with the connector hole 403. Then, thread the air inlet connector 533 through the connector hole 403 and install it on the rotating inner bushing 53. At this time, prepare the pneumatic system. Connect the controller of the pneumatic system to the control panel or computer for communication. After connecting the air compressor of the pneumatic system to the pressure regulating valve, pass the pneumatic pipeline through the reserved hole in the center of the head assembly 1 and through the inner tube 3 to the rotating inner bushing 53. Connect the air pipe to the air inlet connector 533. At this time, the inner wall compaction support structure 5 is installed.

[0058] During operation, one end of the head assembly 1 is fixedly connected to the drilling machine. The drilling machine will drive the outer tube 2, the modular combination reaming structure 6 and the drill bit 11 to rotate while applying pressure. The drill bit 11 is aligned with the location where the exploration borehole needs to be drilled. Under the rotation of the drill bit 11, the soil and rock layers will be excavated and excavated. With the help of the mud pump, water is injected and mud is pumped into the hole to achieve the need for deeper drilling. During the drilling process, the drill bit 11 grinds and excavates the soil and rock layers to achieve the initial opening of the hole.

[0059] During drilling, the air compressor is used to alternately input positive and negative air pressure into the air inlet connector 533. When the air inlet connector 533 inputs positive air pressure into the air groove 532, the lower piston rod 511 is pushed to slide in the piston hole 510 under the action of air pressure. At this time, the second tube 411 pushes the compaction plate 512 to move to one side of the hole wall. The compaction plate 512 is used to press against the hole wall to compact the hole diameter. After the positive air pressure is input, the air compressor generates negative air pressure to suck out the air in the air groove 532. Under the action of negative pressure, the piston rod 511 is pulled back. At this time, the compaction plate 512 retracts into the receiving groove 513. The chamfered grooves at the upper and lower ends of the compaction plate 512 can prevent soil from being brought into the receiving groove 513. During the excavation, the compaction plate 512 presses against the hole wall in stages and retracts, which can play a role in compacting the hole wall and reducing the possibility of hole collapse.

[0060] Example 2: Refer to Figure 6-7 and Figure 9 To ensure proper connection between the inner tube 3 and the mounting bracket 9 after the inner wall compaction support structure 5 is installed, the short-connection structure 4 includes: a first short tube 40, threadedly connected to the end of the inner tube 3 furthest from the head assembly 1; and a second short tube 41, threadedly connected to the end of the first short tube 40 furthest from the head assembly 1. The first short tube 40 includes: a first connector 401 and a first tube body 402, which are integrally formed. The first connector 401 has an external thread, and the first tube body 402 has an internal thread. The first short tube 40 is threaded to the inner tube 3 via a first connector 401; the connector hole 403 is formed on the first tube body 402; the second short tube 41 includes a second connector 410 and a second tube body 411, which are integrally formed; the second connector 410 is threaded to the outside; the second short tube 41 is threaded to the first tube body 402 on the first short tube 40 via the second connector 410; and the second tube body 411 has a slot 412 inside.

[0061] During installation, the first short tube 40 is threadedly connected to the end of the inner tube 3 away from the head assembly 1 via the first connector 401. Then, the retaining ring 10 is inserted into the retaining seat 9, and the retaining seat 9 is inserted into the slot 412. The second short tube 41 is threadedly connected to the first tube body 402 via the second connector 410. At this time, the second short tube 41 is threadedly connected to the first short tube 40, and the retaining seat 9 is engaged in the second short tube 41. The remaining features are the same as in Embodiment 1.

[0062] Example 3: Refer to Figure 4 and Figure 8 In order to realize the modular combination application of multi-diameter reaming drill bits, the modular combination reaming structure 6 includes: a modular drill bit 60, which is integrally formed by a module connector 601, a diamond drill bit 602 and a drill bit body 603. The module connector 601 is fixedly installed at both ends of the drill bit body 603. One end of the module connector 601 has an external thread and the other end has an internal thread. The end of the module connector 601 with the external thread is threaded to the compaction joint 52, and the end of the module connector 601 with the internal thread is threaded to the drill bit 11.

[0063] Install an appropriate number of modular drill bits 60 according to the drilling requirements. If multiple modular drill bits 60 are installed, the outer diameter of the modular drill bit 60 that is closer to the compactor 50 is larger. After installing the modular drill bits 60, thread the drill bit 11 to the last modular drill bit 60. At this point, the entire device is installed.

[0064] As the device penetrates deeper, the modular drill bit 60 will further enlarge the hole opened by the drill bit 11. Through the modular design of the modular drill bit 60, this device can gradually enlarge the small hole to the required diameter during the device's excavation. In this way, when selecting the size of the drill bit 11, a smaller diameter drill bit can be used, which can avoid the drill getting stuck due to the use of a large diameter drill bit. At the same time, the small diameter drill bit can reduce the pressure on the drill rod. The other features are the same as in Embodiment 1.

[0065] Working principle: During installation, first connect the head assembly 1 to the inner tube 3 via the second thread 8 and tighten it. Then, insert the inner tube 3 into the outer tube 2. Next, connect the head assembly 1 to the outer tube 2 via the first thread 7 and tighten it. Connect the first short tube 40 to the end of the inner tube 3 away from the head assembly 1 via the first connector 401. Then, insert the retaining ring 10 into the retaining seat 9 and insert the retaining seat 9 into the slot 412. Connect the second short tube 41 to the first tube body 402 via the second connector 410. At this time, the second short tube 41 is threaded to the first short tube 40, and the retaining seat 9 is secured in the second short tube 41. Next, prepare to install the inner wall compaction support structure 5. Connect the compactor 50 to the end of the outer pipe 2 away from the head assembly 1 via the compaction connector 52. Through precise thread design, after the compactor 50 is tightened, the opening of the air inlet connector 533 should be aligned with the connector hole 403. Then, thread the air inlet connector 533 through the connector hole 403 and install it on the rotating inner bushing 53. At this time, prepare the pneumatic system. Connect the controller of the pneumatic system to the control panel or computer, and connect the air compressor of the pneumatic system to the pressure regulating valve to supply air. After the moving pipeline passes through the reserved hole in the center of the head assembly 1, it passes through the inner tube 3 to the rotating inner bushing 53, and the air pipe is connected to the air inlet connector 533. At this time, the inner wall compaction support structure 5 is installed. According to the drilling needs, install an appropriate number of modular drill bits 60. If multiple modular drill bits 60 are installed, the outer diameter of the modular drill bit 60 is larger the closer it is to the compactor 50. After the modular drill bits 60 are installed, thread the drill bit 11 to the last modular drill bit 60. At this time, the entire device is installed.

[0066] During operation, one end of the head assembly 1 is fixedly connected to the drilling machine. The drilling machine will drive the outer tube 2, the modular combination reaming structure 6, and the drill bit 11 to rotate while applying pressure. The drill bit 11 is aligned with the location of the exploration borehole. Under the rotation of the drill bit 11, the soil and rock layers will be excavated and excavated. With the help of the mud pump, water is injected and slurry is pumped into the hole to achieve the need for deeper drilling. During the drilling process, the drill bit 11 grinds and excavates the soil and rock layers to achieve the initial hole opening. As the device goes deeper, the modular drill bit 60 will further enlarge the hole opened by the drill bit 11. Through the modular design of the modular drill bit 60, this device can gradually enlarge the small hole to the required diameter during the device's excavation. In this way, the size of the drill bit 11 can be selected with a smaller diameter drill bit, which can avoid the drill jam caused by using a large diameter drill bit. At the same time, the small diameter drill bit can reduce the pressure on the drill rod.

[0067] During drilling, the air compressor is used to alternately input positive and negative air pressure into the air inlet connector 533. When the air inlet connector 533 inputs positive air pressure into the air groove 532, the piston rod 511 is pushed to slide in the piston hole 510 under the action of air pressure. At this time, the second tube 411 pushes the compaction plate 512 to move to one side of the hole wall. The compaction plate 512 is used to press against the hole wall to compact the hole diameter. After the positive air pressure is input, the air compressor generates negative air pressure to suck out the air in the air groove 532. Under the action of negative pressure, the piston rod 511 is pulled back. At this time, the compaction plate 512 retracts into the receiving groove 513. The chamfered grooves at the upper and lower ends of the compaction plate 512 can prevent soil from being brought into the receiving groove 513. During the excavation, the compaction plate 512 presses against the hole wall in stages and retracts, which can play a role in compacting the hole wall and reducing the possibility of hole collapse.

[0068] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A geological drilling reamer, comprising a head assembly (1), an outer tube (2), an inner tube (3), a retainer (9), a retaining ring (10), and a drill bit (11), wherein a first thread (7) is provided on the fixed end of the outer shell of the head assembly (1), and a second thread (8) is provided on the rotating shaft inside the head assembly (1), wherein the head assembly (1) is threadedly connected to the inner tube (3) via the second thread (8), and the head assembly (1) is threadedly connected to the outer tube (2) via the first thread (7), characterized in that: The drilling reamer also includes: The short-circuit connection structure (4) is threaded to the inner tube (3) at one end, and is used to fix the inner tube (3) to the card seat (9); The inner wall compaction support structure (5) is threaded to the outer tube (2) at one end and is used to compact the hole wall after the hole is enlarged to prevent the hole wall from collapsing. The modular combination hole-enlarging structure (6) is threaded at one end to the inner wall compaction support structure (5) and at the other end to the drill bit (11), and is used to widen the hole diameter of the drill bit (11).

2. The geological drilling reamer according to claim 1, characterized in that, The outer tube (2) has an internal thread at one end and an external thread at the other end. The head assembly (1) is threaded to the end of the outer tube (2) with an internal thread through the first thread (7). The inner tube (3) has internal threads at both ends.

3. The geological drilling reamer according to claim 1, characterized in that, The short-circuit connection structure (4) includes: The first short connector (40) is threaded to the end of the inner tube (3) away from the head assembly (1); The second short connector (41) is threaded to the end of the first short connector (40) away from the head assembly (1).

4. A geological drilling reamer according to claim 3, characterized in that, The first short connector (40) includes: The first connector (401) and the first tube (402) are integrally formed. The first connector (401) has an external thread, and the first tube (402) has an internal thread. The first short tube (40) is threaded to the inner tube (3) through the first connector (401). The connector hole (403) is provided on the first tube body (402).

5. A geological drilling reamer according to claim 4, characterized in that, The second short connector (41) includes: The second connector (410) and the second tube body (411) are integrally formed. The second connector (410) has an external thread. The second short tube (41) is threadedly connected to the first tube body (402) on the first short tube (40) through the second connector (410). The second tube body (411) has a slot (412) inside.

6. A geological drilling reamer according to claim 1, characterized in that, The inner wall compaction support structure (5) includes: The compactor (50) is threadedly connected to the outer tube (2) at one end. The compactor (50) consists of a compaction tube body (51), a compaction joint (52), and a rotating inner bushing (53). The compaction tube body (51) and the compaction joint (52) are integrally formed. The compaction joint (52) is fixedly installed at both ends of the compaction tube body (51). The compaction joint (52) has an internal thread. The rotating inner bushing (53) is rotatably installed on the inner ring of the compaction tube body (51).

7. A geological drilling reamer according to claim 6, characterized in that, The compacted tube body (51) includes: A sealing and limiting groove (514) is formed in the inner ring of the compacted pipe body (51); Piston hole (510) is opened inside compaction tube (51), and one end of piston hole (510) is connected to the inner ring of compaction tube (51); The storage groove (513) is circumferentially distributed on the outer ring of the compacted tube body (51), and the storage groove (513) is connected to the piston hole (510) at the end away from the inner ring of the compacted tube body (51). The piston rod (511) and the compaction plate (512) are fixedly connected. The piston rod (511) is slidably installed in the piston hole (510), and the compaction plate (512) is slidably installed in the storage groove (513). The upper and lower sides of the side of the compaction plate (512) away from the piston rod (511) are chamfered.

8. A geological drilling reamer according to claim 7, characterized in that, The rotating inner bushing (53) includes: The limiting protrusion (530) is fixedly installed on the outer ring of the rotating inner bushing (53), and the limiting protrusion (530) is rotatably installed in the sealing limiting groove (514); The sealing ring (531) is installed in the sealing limiting groove (514) and located below the limiting protrusion (530); An air groove (532) is formed on the outer ring of the rotating inner bushing (53) and located between two limiting protrusions (530); The air inlet connector (533) is threaded into the inner ring of the rotating inner bushing (53), and the air inlet connector (533) communicates with the air groove (532). The air inlet connector (533) passes through the slot (412).

9. A geological drilling reamer according to claim 1, characterized in that, The module combination enlargement structure (6) includes: The modular drill bit (60) is integrally formed from a module connector (601), a diamond drill bit (602) and a drill bit body (603). The module connector (601) is fixedly installed at both ends of the drill bit body (603). One end of the module connector (601) has an external thread and the other end has an internal thread. The external thread end of the module connector (601) is threaded to the compaction joint (52), and the internal thread end of the module connector (601) is threaded to the drill bit (11).

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