Umbrella hydraulic reaming mechanism

Abstract

The application relates to the technical field of drill pipe reaming, and discloses an umbrella type hydraulic reaming mechanism, wherein the last section drill pipe comprises front end rod, middle rod and rear end rod which are fixedly connected in sequence; a support driving assembly is fixed in the last section drill pipe; a reaming assembly is movably connected between the front movable connecting groove and the corresponding rear movable connecting groove, the middle part of the reaming assembly is provided with a reinforcing auxiliary part which is slidably connected with the middle rod; the rear part of the reaming assembly extends into the last section drill pipe through the avoiding groove in the rear movable connecting groove and is movably connected with the support driving assembly, and the support driving assembly is used for driving the reaming assembly to open or close. The application has the advantages that the structure is compact, the support driving assembly is integrated in the hollow drill pipe and is prevented from being exposed, interference with the hole wall is prevented, the drilling fluid, impurities and the like are prevented from corroding and being stuck in the drill pipe, the service life of the components is prolonged, the rod parts are convenient to disassemble and assemble, the damaged reaming assembly can be replaced, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of drill pipe reaming technology, specifically to an umbrella-type hydraulic reaming mechanism. Background Technology

[0002] In borehole reaming operations, existing reaming mechanisms connected to the drill pipe and the drive components used to open the reaming mechanism generally suffer from loose structures and excessive size. The reaming mechanism and drive components are mostly exposed outside the drill pipe, making them susceptible to corrosion from drilling fluid and impurities, and prone to interference with the borehole wall. Furthermore, the grooved gaps at the connection points between the reaming mechanism / drive components and the drill pipe allow drilling fluid and impurities to easily get stuck in the drill pipe during reaming operations. Simultaneously, the connections of the reaming mechanism are prone to loosening due to vibration, making component disassembly and assembly inconvenient and maintenance costs high. To address these issues, we have introduced an umbrella-type hydraulic reaming mechanism. Summary of the Invention

[0003] The purpose of this invention is to provide an umbrella-type hydraulic reaming mechanism to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A type of umbrella-shaped hydraulic reaming mechanism includes a final drill rod, wherein the final drill rod includes a front end rod, a middle rod, and a rear end rod that are fixedly connected in sequence.

[0006] A drill bit is fixed to the front end of the front end member, and a support drive assembly is fixed inside the last section of the drill rod.

[0007] The connection between the front end member and the middle member has several sets of front movable connecting grooves distributed in a circular and equally spaced manner. The connection between the middle member and the rear end member has several sets of rear movable connecting grooves distributed in a circular and equally spaced manner. A hole-expanding assembly is movably connected between the front movable connecting groove and the corresponding rear movable connecting groove. The hole-expanding assembly has a reinforcing auxiliary member that slides with the middle member in the middle part.

[0008] The rear part of the reaming assembly extends into the interior of the last section of the drill rod via a clearance groove in the rear movable connecting groove and is movably connected to the support drive assembly. The support drive assembly is used to drive the reaming assembly to open or close.

[0009] Preferably, the front-end member includes a front-end rod body, the middle member includes a middle hollow rod body, and the rear-end member includes a rear hollow rod body;

[0010] The front end of the rod body is provided with an internal threaded hole, and the rear end of the drill bit is provided with an external threaded post, which is screwed into the internal threaded hole.

[0011] The middle hollow rod is fixedly connected to the front rod and the rear hollow rod by long screws at both ends.

[0012] Preferably, the rear end of the front rod is provided with several sets of first arc-shaped slots at equal intervals in a circular shape;

[0013] The front end of the hollow middle rod is provided with several sets of second arc-shaped slots at equal intervals in a circular shape, and the rear end of the hollow middle rod is provided with several sets of third arc-shaped slots at equal intervals in a circular shape.

[0014] The front end of the hollow rear rod is circularly and equally spaced with several sets of fourth arc-shaped slots.

[0015] The front movable connecting groove is formed by the cooperation of a first arc-shaped groove and a corresponding second arc-shaped groove, and the rear movable connecting groove is formed by the cooperation of a third arc-shaped groove and a corresponding fourth arc-shaped groove.

[0016] The third arc-shaped slot has a front section slot, the fourth arc-shaped slot has a rear section slot, and the clearance slot is formed by the cooperation of the front section slot and the corresponding rear section slot.

[0017] Preferably, a first protrusion is provided between adjacent first arc-shaped slots, and a second protrusion is provided between adjacent fourth arc-shaped slots;

[0018] An inner groove is provided between adjacent second arc-shaped slots and between adjacent third arc-shaped slots;

[0019] The first protrusion and the second protrusion are respectively inserted into their corresponding inner grooves.

[0020] Preferably, the hole enlarging assembly includes a front rotating disk movably connected in the front movable connecting groove, a mounting plate fixed on the front rotating disk by a connecting block, an enlarging plate fixed on the mounting plate, a drive rod movably connected to the rear of the mounting plate by a connecting ear plate, and a rear rotating disk movably connected in the rear movable connecting groove.

[0021] The drive rod extends through a through hole on the rear rotating disk.

[0022] Preferably, the middle rod has circular protrusions at equal intervals in the middle, and an arc-shaped reinforcing plate connects adjacent protrusions. The protrusions are provided with arc-shaped grooves inside.

[0023] The reinforcing auxiliary component includes a fixed bracket fixed to the enlarged plate and an arc-shaped reinforcing slider fixed to the fixed bracket, with the arc-shaped reinforcing slider sliding into the corresponding arc-shaped groove.

[0024] Preferably, the inner wall of the enlarged plate is provided with a recessed groove for fixing the mounting plate, and the outer wall surface of the enlarged plate is provided with an enlarged protrusion;

[0025] The outer end of the drive rod is movably connected to the connecting lugs by a pin.

[0026] Preferably, the support drive assembly includes a front fixing ring, a rear mounting plate fixed at the rear end of the front fixing ring by a number of equally spaced arc-shaped support plates, a hydraulic cylinder fixed at the center of the rear end of the rear mounting plate, and a movable seat fixed by the piston rod at the output end of the hydraulic cylinder.

[0027] The movable seat is provided with several sets of U-shaped seats at equal intervals. The U-shaped seats slide between adjacent arc-shaped support plates. The inner end of the drive rod extends into the clearance groove and is fixed with a sliding rod. The two ends of the sliding rod slide in the inclined sliding groove on the U-shaped seat.

[0028] Compared with existing technologies, the advantages of this invention are: The invention has a compact structure, with the support and drive components integrated inside the hollow drill pipe, avoiding exposure and preventing interference with the borehole wall. This also prevents drilling fluid and impurities from corroding the drill pipe and causing it to jam, thus extending component life. The components are easy to assemble and disassemble, allowing for replacement of damaged reaming components and reducing maintenance costs. The reaming component is movably connected between the front and rear movable connecting slots, preventing vibration from causing loosening at the connection between the reaming component and the last section of the drill pipe, limiting the movement trajectory of the reaming component, and, in conjunction with the reinforced auxiliary structure, ensuring stable and precise reaming. This invention achieves reaming by squeezing the rock fracture zone after the reaming component opens, effectively performing reaming operations during drilling, eliminating the need for secondary reaming steps, and thus increasing efficiency. Attached Figure Description

[0029] Figure 1 This is an exploded structural diagram of the overall assembly of the present invention;

[0030] Figure 2 This is an exploded structural diagram of the assembly of the front-end member, the middle member, and the rear-end member of the present invention.

[0031] Figure 3 For the present invention Figure 2 A schematic diagram of the three-dimensional structure from another perspective;

[0032] Figure 4 This is a cross-sectional structural schematic diagram of the intermediate rod of the present invention;

[0033] Figure 5 This is a three-dimensional structural diagram of the connection between the drill bit and the last section of the drill rod according to the present invention;

[0034] Figure 6 For the present invention Figure 5 A schematic diagram of the cross-sectional structure;

[0035] Figure 7 This is an exploded structural diagram of the hole-expanding assembly of the present invention;

[0036] Figure 8 This is a three-dimensional structural diagram of the hole-expanding assembly of the present invention;

[0037] Figure 9This is an exploded structural diagram of the supporting drive component assembly of the present invention;

[0038] Figure 10 This is a three-dimensional structural diagram of the overall supporting drive component of the present invention;

[0039] Figure 11 This is a three-dimensional structural diagram of the connection between the hole-expanding assembly and the movable base of the present invention;

[0040] Figure 12 This is a three-dimensional structural diagram of the connection between the hole-reaming assembly and the last section of the drill rod of the present invention;

[0041] Figure 13 This is a three-dimensional structural diagram of the entire invention;

[0042] Figure 14 For the present invention Figure 13 A schematic diagram of the three-dimensional structure from another perspective;

[0043] Figure 15 For the present invention Figure 14 A cross-sectional structural diagram.

[0044] In the diagram: 1. Drill bit; 101. External threaded post; 2. Front end member; 201. Front end member; 202. First arc-shaped slot; 203. First protrusion; 204. Reserved hole; 205. Internal threaded hole; 3. Middle member; 301. Middle hollow member; 302. Long screw; 303. Third arc-shaped slot; 304. Front section slot; 305. Internal groove; 306. Protrusion seat; 307. Arc-shaped slide groove; 308. Second arc-shaped slot; 309. Arc-shaped reinforcing plate; 4. Rear end member; 401. Rear hollow member; 402. Flange ring; 403. Fourth arc-shaped slot; 404. Rear section slot; 405. Second protrusion; 5. Expanding... Hole assembly; 501, reaming plate; 502, reaming protrusion; 503, concave groove; 504, mounting plate; 505, connecting block; 506, front rotating disk; 507, connecting ear plate; 508, pin; 509, drive rod; 510, rear rotating disk; 511, slide rod; 512, arc-shaped reinforced slider; 513, fixed bracket; 6, support drive assembly; 601, front fixing ring; 602, bolt; 603, arc-shaped support plate; 604, piston rod; 605, moving seat; 606, U-shaped seat; 607, inclined slide groove; 608, rear mounting plate; 609, hydraulic cylinder; 7, front movable connecting groove; 8, rear movable connecting groove; 9, clearance groove. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Example:

[0047] Please see Figures 1-15 The present invention provides a technical solution:

[0048] An umbrella-type hydraulic reaming mechanism includes a final drill rod, which comprises a front rod 2, a middle rod 3, and a rear rod 4, which are fixedly connected in sequence. The front rod 2 includes a front rod body 201, the middle rod 3 includes a middle hollow rod body 301, and the rear rod 4 includes a rear hollow rod body 401. The middle hollow rod body 301 and the rear hollow rod body 401 have a hollow structure, which can accommodate the support drive assembly 6, reduce the overall volume of the mechanism, and save installation space. The middle hollow rod body 301 is fixedly connected to the front rod body 201 and the rear hollow rod body 401 respectively through long screws 302 at both ends.

[0049] The long screw 302 connection method ensures the firmness of the connection between the three parts, avoids loosening of the connection due to vibration during hole expansion, and facilitates disassembly, allowing for individual replacement of damaged rods, reducing maintenance costs. The front rod 201 has several sets of first arc-shaped slots 202 arranged in a circular shape at equal intervals at its rear end. The middle hollow rod 301 has several sets of second arc-shaped slots 308 arranged in a circular shape at equal intervals at its front end, several sets of third arc-shaped slots 303 arranged in a circular shape at equal intervals at its rear end, and several sets of fourth arc-shaped slots 403 arranged in a circular shape at equal intervals at its front end. The front movable connecting groove 7 is formed by the cooperation of the first arc-shaped slots 202 and the corresponding second arc-shaped slots 308. The rear movable connecting groove... The groove 8 is formed by the cooperation of the third arc-shaped groove 303 and the corresponding fourth arc-shaped groove 403. The front rotating disk 506 is movably connected in the front movable connecting groove 7, and the rear rotating disk 510 is movably connected in the rear movable connecting groove 8. This design can precisely limit the rotation trajectory of the front rotating disk 506 and the rear rotating disk 510, ensuring that the reaming assembly 5 opens / closes smoothly in the radial direction, avoiding deviation and ensuring reaming accuracy. At the same time, it can reduce the frictional resistance during the rotation of the front rotating disk 506 and the rear rotating disk 510, extend the service life of the components, and this connection makes the connection between the reaming assembly 5 and the last section of the drill pipe sealed, without affecting the opening and retraction of the reaming assembly 5, and preventing drilling fluid and impurities from entering the last section of the drill pipe during reaming operations.

[0050] The third arc-shaped slot 303 has a front slot 304, and the fourth arc-shaped slot 403 has a rear slot 404. The clearance groove 9 is formed by the cooperation of the front slot 304 and the corresponding rear slot 404. The clearance groove 9 can provide the sliding rod 511 at the inner end of the drive rod 509 with a space to avoid interference between the drive rod 509 and the inner wall of the last section of the drill pipe when the drive rod 509 moves, ensuring a smooth drive process, and at the same time protecting the sliding rod 511 and the drive rod 509 from collision damage.

[0051] A first protrusion 203 is provided between adjacent first arc-shaped slots 202, a second protrusion 405 is provided between adjacent fourth arc-shaped slots 403, and inner grooves 305 are provided between adjacent second arc-shaped slots 308 and adjacent third arc-shaped slots 303. The first protrusion 203 and the second protrusion 405 are respectively inserted into the corresponding inner grooves 305. This can further enhance the connection stability between the front end rod 2 and the middle rod 3, and between the middle rod 3 and the rear end rod 4, and prevent the three from rotating relative to each other during the rotation and hole expansion process.

[0052] The front end of the front rod 2 is fixed with a drill bit 1. The front end of the front rod 201 is provided with an internal threaded hole 205. The rear end of the drill bit 1 is provided with an external threaded post 101, which is screwed into the internal threaded hole 205. The last section of the drill rod is fixed with a support drive assembly 6. The support drive assembly 6 includes a front fixing ring 601, a rear mounting plate 608 fixed at the rear end of the front fixing ring 601 by several sets of equally spaced arc-shaped support plates 603, and a hydraulic system fixed in the center at the rear end of the rear mounting plate 608. The piston rod 604 at the output end of the hydraulic cylinder 609 is fixed to the movable seat 605. The front fixing ring 601 is fixed to the reserved hole 204 in the middle of the rear end of the front rod 201 by bolts 602. The front fixing ring 601 is supported on the inner wall of the reserved hole 204. The outer wall of the arc-shaped support plate 603 is supported on the inner wall of the reserved hole 204, the middle hollow rod 301 and the rear hollow rod 401. The rear mounting plate 608 is supported on the inner wall of the rear hollow rod 401.

[0053] The support drive assembly 6 is firmly fixed inside the last section of the drill rod to ensure that it does not shift or shake during rotation and hole enlargement. At the same time, the arc-shaped support plate 603 is designed to fit tightly against the inner wall of the drill rod, which can enhance the overall structural strength of the drill rod, disperse the vibration generated during hole enlargement, and reduce the deformation of the drill rod.

[0054] The evenly spaced arc-shaped support plates 603 can distribute the support force evenly, avoiding excessive local stress that could damage the components. The rear hollow rod body 401 has a flange ring 402 on its outer rear end. The flange ring 402 facilitates the connection of the last section of the drill rod with other rotating rods. The external drive mechanism (such as the drill rod drive device) then transmits rotational power to the last section of the drill rod stably through other rotating rods, ensuring that the last section of the drill rod drives the hole-reaming assembly 5 to rotate synchronously, thus ensuring the stability and continuity of the hole-reaming process.

[0055] The movable seat 605 is provided with several sets of U-shaped seats 606 at equal intervals. The U-shaped seats 606 slide between adjacent arc-shaped support plates 603. The inner end of the drive rod 509 extends through the clearance groove 9 and is fixed with a slide rod 511. The two ends of the slide rod 511 slide in the inclined sliding grooves 607 on the U-shaped seats 606. A gap is formed between adjacent arc-shaped support plates 603, which can provide guidance for the sliding of the movable seat 605, ensuring that the movable seat 605 moves smoothly along the axial direction and avoids deviation.

[0056] The support drive assembly 6 is integrated inside the last section of the drill pipe. It has a compact structure, does not occupy external space, avoids interference with the inner wall of the borehole during the hole enlargement process, and can protect the internal components from the corrosion of drilling fluid and impurities, thus extending the service life of the assembly.

[0057] A hydraulic cylinder 609 is used as the driving source, and the piston rod 604 is fixedly connected to the moving seat 605. The hydraulic drive method has the advantages of strong power, stable driving force and high adjustment precision. It can accurately control the moving distance of the moving seat 605, and thus accurately control the opening amplitude of the hole expansion component 5 to meet the hole expansion requirements of different sizes. At the same time, the hydraulic drive has a fast response speed and can quickly complete the opening and resetting of the hole expansion component 5, improving work efficiency.

[0058] The two ends of the slide rod 511 on the inner side of the drive rod 509 are slidably connected to the inclined slide groove 607 on the U-shaped seat 606. This connection method converts the axial linear motion of the hydraulic cylinder 609 into the radial rotation of the drive rod 509, which has high transmission efficiency and controllable motion trajectory. The design of the inclined slide groove 607 can adjust the tilt angle according to the hole enlargement range requirements, flexibly adapting to different hole enlargement sizes. At the same time, the sliding fit can reduce frictional resistance during the movement, reduce component wear, and improve the smoothness of transmission.

[0059] At the connection between the front end member 2 and the middle member 3, several sets of front movable connecting grooves 7 are distributed in a circular and equally spaced manner. At the connection between the middle member 3 and the rear end member 4, several sets of rear movable connecting grooves 8 are distributed in a circular and equally spaced manner. A hole-expanding assembly 5 is movably connected between the front movable connecting groove 7 and the corresponding rear movable connecting groove 8. The hole-expanding assembly 5 has a reinforcing auxiliary component that slides with the middle member 3 in the middle part. The hole-expanding assembly 5 includes a front rotating disk 506 movably connected in the front movable connecting groove 7, a mounting plate 504 fixed on the front rotating disk 506 by a connecting block 505, a hole-expanding plate 501 fixed on the mounting plate 504, a drive rod 509 movably connected to the rear of the mounting plate 504 by a connecting ear plate 507, and a rear rotating disk 510 movably connected in the rear movable connecting groove 8. The drive rod 509 extends through a through hole on the rear rotating disk 510.

[0060] The middle rod 3 has circular, equally spaced protrusions 306 in its center, and an arc-shaped reinforcing plate 309 connects adjacent protrusions 306. The protrusions 306 have an arc-shaped groove 307 inside. The arc-shaped reinforcing plate 309 can enhance the overall structural strength of the middle rod 3 and prevent the middle rod 3 from deforming due to excessive force during the hole enlargement process. The design of the protrusions 306 can provide an installation carrier for the arc-shaped groove 307, and at the same time, it can limit the arc-shaped reinforcing slider 512 to ensure its accurate sliding trajectory.

[0061] The reinforcing auxiliary components include a fixed bracket 513 fixed to the expanding plate 501 and an arc-shaped reinforcing slider 512 fixed to the fixed bracket 513. The arc-shaped reinforcing slider 512 slides into the corresponding arc-shaped groove 307. This structure can guide and support the expanding plate 501, preventing the expanding plate 501 from shifting or shaking during opening and rotation, ensuring that the expanding plate 501 always moves radially and guaranteeing the expanding accuracy. At the same time, the sliding engagement between the arc-shaped reinforcing slider 512 and the arc-shaped groove 307 can disperse the cutting force on the expanding plate 501, reduce the deformation of the expanding plate 501, and extend its service life.

[0062] The front end of the reaming plate 501 gradually decreases in size. This design reduces the contact area between the reaming plate 501 and the inner wall of the borehole in the initial stage of reaming, reduces contact resistance, facilitates the smooth opening of the reaming plate 501 and its cutting into the borehole wall, avoids damage to components due to excessive resistance in the initial stage of reaming, and prevents the borehole wall from cracking or being damaged, thus ensuring the quality of the borehole wall.

[0063] The inner wall of the expansion plate 501 is provided with a recessed groove 503 for fixing the mounting plate 504, and the outer wall surface of the expansion plate 501 is provided with an expansion protrusion 502. The outer end of the drive rod 509 is movably connected to the connecting ear plate 507 by a pin 508.

[0064] Multiple sets of hole-reaming components 5 are distributed in a circular and equally spaced manner (corresponding to the front movable connecting groove 7 and the rear movable connecting groove 8), which can make the inner wall of the hole uniformly stressed during the hole-reaming process, avoid the situation of local hole-reaming being too large or too small, and ensure hole-reaming accuracy and hole wall flatness.

[0065] The rear part of the reaming assembly 5 extends into the interior of the last section of the drill rod via the clearance groove 9 in the rear movable connecting groove 8 and is movably connected to the support drive assembly 6. The support drive assembly 6 is used to drive the reaming assembly 5 to open or close.

[0066] Specifically, when using it:

[0067] The core working logic of this umbrella-type hydraulic reaming mechanism is that the support drive component 6 provides hydraulic power to drive the reaming component 5 to open or close along a preset trajectory. This, combined with the overall rotation of the last section of the drill rod, enables the reaming operation after drilling. The specific working process is divided into three stages: initial state, reaming state, and reset state. The linkage process of each stage is as follows:

[0068] (a) Initial state:

[0069] When the mechanism is not in operation, the piston rod 604 of the hydraulic cylinder 609 is in a retracted state, and the piston rod 604 drives the movable seat 605 to the rear end position. At this time, the U-shaped seat 606 on the movable seat 605 cooperates with the slide rod 511 on the inner end of the drive rod 509 through the inclined slide groove 607, applying an inward pulling force to the drive rod 509, so that the hole expansion assembly 5 remains in a closed state.

[0070] The arc-shaped reinforcing slider 512 of the hole-expanding assembly 5 is engaged in the arc-shaped sliding groove 307 of the intermediate rod 3 to limit the radial displacement of the hole-expanding assembly 5 and ensure the stability of the closed state.

[0071] The front rotating disk 506 is embedded in the front movable connecting groove 7, the rear rotating disk 510 is embedded in the rear movable connecting groove 8, and the hole expansion plate 501 is attached to the outside of the last section of the drill rod. The overall structure is compact, which makes it easy for the mechanism to be lowered into the borehole together with the last section of the drill rod.

[0072] Meanwhile, the drill bit 1 is screwed to the internal threaded hole 205 of the front rod 201 through the external threaded post 101, and rotates synchronously with the front rod 2, so that the basic drilling operation can be completed first.

[0073] (ii) Hole enlargement state:

[0074] After the basic drilling is completed, the hydraulic cylinder 609 is activated. The hydraulic cylinder 609 pushes the piston rod 604 forward, causing the movable seat 605 to slide forward along the gap between the arc-shaped support plates 603 (the U-shaped seat 606 slides with the adjacent arc-shaped support plate 603 to ensure that the movable seat 605 slides smoothly).

[0075] When the movable seat 605 moves forward, the inclined slide groove 607 on the U-shaped seat 606 slides relative to the slide rod 511. The inclined slide groove 607 generates an outward pushing force on the slide rod 511, which in turn pushes the drive rod 509 to rotate outward around the connection between the connecting ear plate 507 and the pin 508.

[0076] When the outer end of the drive rod 509 rotates, it drives the rear rotating disk 510 to rotate in the rear movable connecting groove 8. At the same time, it drives the front rotating disk 506 to rotate synchronously in the front movable connecting groove 7 through the connecting ear plate 507, mounting plate 504, and connecting block 505.

[0077] Since the front movable connecting groove 7 is formed by the first arc-shaped groove 202 of the front end rod 201 and the second arc-shaped groove 308 of the middle hollow rod 301, and the rear movable connecting groove 8 is formed by the third arc-shaped groove 303 of the middle hollow rod 301 and the fourth arc-shaped groove 403 of the rear hollow rod 401, the rotation trajectory of the front rotating disk 506 and the rear rotating disk 510 is limited within the arc-shaped groove, ensuring that the hole expansion assembly 5 opens along the preset radial direction.

[0078] During the opening process of the hole-enlarging assembly 5, the arc-shaped reinforcing slider 512 on the hole-enlarging plate 501 slides along the arc-shaped groove 307 in the protrusion seat 306 of the intermediate rod 3, which guides and supports the hole-enlarging plate 501, preventing the hole-enlarging plate 501 from shifting or shaking during the opening process. Furthermore, when the hole-enlarging plate 501 is performing hole-enlarging operations, it can further strengthen the connection of the hole-enlarging plate 501 and further enhance the firmness of the connection of the hole-enlarging assembly 5.

[0079] As the hydraulic cylinder 609 continues to push, the reaming plate 501 gradually opens outward, and the reaming protrusion 502 on its outer wall contacts the inner wall of the borehole. At this time, the last section of the drill rod rotates as a whole, driving the reaming plate 501 to rotate synchronously. The reaming protrusion 502 cuts and reams the inner wall of the borehole until the preset reaming size is reached.

[0080] The gradually decreasing front end size of the reaming plate 501 reduces the contact resistance between the reaming plate and the inner wall of the borehole in the initial stage, making it easier for the reaming plate 501 to open smoothly and cut into the borehole wall.

[0081] (III) Reset Status:

[0082] After the reaming operation is completed, the hydraulic cylinder 609 retracts, the piston rod 604 drives the moving seat 605 to return to its original position, the inclined groove 607 of the U-shaped seat 606 generates an inward pulling force on the slide rod 511, driving the drive rod 509 to rotate in the opposite direction, which in turn drives the front rotating disk 506 and the rear rotating disk 510 to rotate in the opposite direction. The reaming assembly 5 gradually closes, the arc-shaped reinforcing slider 512 returns to its original position along the arc-shaped groove 307, and finally the reaming plate 501 fits against the outside of the last section of the drill rod. The mechanism returns to its initial compact state, making it easy to remove the whole assembly from the borehole.

[0083] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A type of umbrella-shaped hydraulic reaming mechanism, comprising a final drill rod section, characterized in that: The last section of the drill pipe includes a front end member, a middle member, and a rear end member that are fixedly connected in sequence. A drill bit is fixed to the front end of the front end member, and a support drive assembly is fixed inside the last section of the drill rod. The connection between the front end member and the middle member has several sets of front movable connecting grooves distributed in a circular and equally spaced manner. The connection between the middle member and the rear end member has several sets of rear movable connecting grooves distributed in a circular and equally spaced manner. A hole-expanding assembly is movably connected between the front movable connecting groove and the corresponding rear movable connecting groove. The hole-expanding assembly has a reinforcing auxiliary member that slides with the middle member in the middle part. The rear part of the reaming assembly extends into the interior of the last section of the drill rod via a clearance groove in the rear movable connecting groove and is movably connected to the support drive assembly. The support drive assembly is used to drive the reaming assembly to open or close. The hole enlarging assembly includes a front rotating disk movably connected in the front movable connecting groove, a mounting plate fixed on the front rotating disk by a connecting block, an enlarging plate fixed on the mounting plate, a drive rod movably connected to the rear of the mounting plate by a connecting ear plate, and a rear rotating disk movably connected in the rear movable connecting groove. The drive rod extends through a through hole on the rear rotating disk; The middle rod has circular protrusions at equal intervals in the middle, and an arc-shaped reinforcing plate connects adjacent protrusions. The protrusions have an arc-shaped sliding groove inside. The reinforcing auxiliary component includes a fixed bracket fixed to the enlarged plate and an arc-shaped reinforcing slider fixed to the fixed bracket, the arc-shaped reinforcing slider sliding into the corresponding arc-shaped groove. The inner wall of the enlarged plate is provided with a recessed groove for fixing the mounting plate, and the outer wall surface of the enlarged plate is provided with an enlarged protrusion. The outer end of the drive rod is movably connected to the connecting lugs by a pin. The support drive assembly includes a front fixed ring, a rear mounting plate fixed by a number of equally spaced arc-shaped support plates at the rear end of the front fixed ring, a hydraulic cylinder fixed in the center at the rear end of the rear mounting plate, and a movable seat fixed by the piston rod at the output end of the hydraulic cylinder. The movable seat is provided with several sets of U-shaped seats at equal intervals. The U-shaped seats slide between adjacent arc-shaped support plates. The inner end of the drive rod extends into the clearance groove and is fixed with a sliding rod. The two ends of the sliding rod slide in the inclined sliding groove on the U-shaped seat.

2. The umbrella-type hydraulic reaming mechanism according to claim 1, characterized in that: The front-end member includes a front-end rod body, the middle member includes a middle hollow rod body, and the rear-end member includes a rear hollow rod body; The front end of the rod body is provided with an internal threaded hole, and the rear end of the drill bit is provided with an external threaded post, which is screwed into the internal threaded hole. The middle hollow rod is fixedly connected to the front rod and the rear hollow rod by long screws at both ends.

3. The umbrella-type hydraulic reaming mechanism according to claim 2, characterized in that: The rear end of the front rod is provided with several sets of first arc-shaped slots at equal intervals in a circular shape. The front end of the hollow middle rod is provided with several sets of second arc-shaped slots at equal intervals in a circular shape, and the rear end of the hollow middle rod is provided with several sets of third arc-shaped slots at equal intervals in a circular shape. The front end of the hollow rear rod is circularly and equally spaced with several sets of fourth arc-shaped slots. The front movable connecting groove is formed by the cooperation of a first arc-shaped groove and a corresponding second arc-shaped groove, and the rear movable connecting groove is formed by the cooperation of a third arc-shaped groove and a corresponding fourth arc-shaped groove. The third arc-shaped slot has a front section slot, the fourth arc-shaped slot has a rear section slot, and the clearance slot is formed by the cooperation of the front section slot and the corresponding rear section slot.

4. The umbrella-type hydraulic reaming mechanism according to claim 3, characterized in that: A first protrusion is provided between adjacent first arc-shaped slots, and a second protrusion is provided between adjacent fourth arc-shaped slots; An inner groove is provided between adjacent second arc-shaped slots and between adjacent third arc-shaped slots; The first protrusion and the second protrusion are respectively inserted into their corresponding inner grooves.

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