Efficient discharging device and method for underwater rock core drilling chippings

Abstract

The invention relates to the field of marine exploration mechanical equipment, in particular to an underwater rock core drilling debris efficient discharging device and method.The device comprises a power head, a drill rod, a connector, a drill bit and a diamond matrix, the power head is communicated with a connecting pipe, the drill rod is of a hollow structure, and a groove is formed in the side, close to the drill rod, of the drill bit; a rock core channel is formed in the side, away from the drill rod, of the drill bit, an annular cylinder is coaxially and fixedly connected to the outer side wall of the drill bit, an annular cavity is formed in the annular cylinder, a plurality of water outlet holes are formed in the side, away from the drill bit, of the outer side wall of the annular cavity, a plurality of through openings are formed in the side wall of the groove and communicate with the annular cavity, and a spiral guide rail is arranged on the outer side wall of the annular cavity in the circumferential direction of the annular cavity. The annular cavity with the spiral flow guide groove and the spiral guide rail are arranged on the outer side of the drill bit, high-pressure water flow is introduced in combination with the hollow drill rod, the water flow washes chippings through the water outlet hole, meanwhile, the spiral guide rail rotates to push waste water containing chippings to rise, and the problems that chippings are difficult to discharge and the drill bit is prone to being stuck in the deepwater environment are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of marine exploration machinery, in particular to a device and method for efficiently discharging drilling debris of underwater core drilling. BACKGROUND

[0002] Underwater carbonate rock refers to the rock structure distributed at the bottom or edge of water such as the sea. Underwater rock plays an important role in the ecological system and human life. In terms of ecology, underwater carbonate rock provides habitat and shelter for numerous marine organisms. Algae and microorganisms growing on the surface of the rock are the food source of fish, crustaceans and other marine organisms. Coral reefs are known as the "marine tropical rainforest" and provide living environment for more than 25% of marine species. At the same time, they can filter impurities in water, purify water quality and protect coastlines from wave erosion.

[0003] Therefore, by analyzing underwater carbonate rock, it is beneficial to understand the mineral composition, structure and construction of underwater carbonate rock, as well as the historical climate and environmental information revealed thereby, so as to provide scientific data for the development and utilization of underwater carbonate rock. At present, underwater rock sampling is usually carried out by underwater hydraulic drilling machine for core sampling. For example, a portable underwater hydraulic drilling machine includes a power station, a hydraulic motor, a power head, a water pump, a drill rod, a drilling tool and a drill bit. The power station provides power to drive the hydraulic motor to rotate. The hydraulic motor transmits power to the power head to drive the drill rod and drill bit to rotate. At the same time, the water pump starts to work to provide continuous water flow to the drill bit and drill rod to timely flush away the drilling debris generated during drilling to avoid the accumulation of drilling debris affecting the drilling efficiency and sampling quality. When reaching the predetermined depth, the rock sample is fixed in the drilling tool, and then the drill rod is slowly lifted to take out the drilling tool with the sample to the water surface to complete the sampling work.

[0004] During the core drilling process using the portable underwater hydraulic drilling machine below the sea surface, the increased water pressure (about 1 atm for every 10 m increase in water depth) increases the resistance of the upward flow of the flushing water flow of the water pump, so that the combined force of the water flow resistance and the water flow gravity is greater than the water pressure thrust provided by the water pump. The upward flow speed of the debris-containing waste water will slow down or even stop, resulting in the inability to effectively discharge the drilling debris from the hole. With the advancement of the drill bit, the drilling debris at the bottom of the drilled rock hole accumulates more and more, gradually filling the gap between the drill rod and the hole wall, hindering the rotation and advancement of the drill rod, and eventually leading to a stuck drill. In addition, fine rock powder can form a dense sediment layer at the bottom of the drilled rock hole, increasing the friction between the drill rod and the hole wall and further exacerbating the risk of stuck drill. After the stuck drill occurs, the workers are forced to abandon the sample and drill bit, resulting in sampling failure and increasing the loss of the drilling machine.

[0005] Therefore, the present application provides a device and method for efficiently discharging drilling debris of underwater core drilling to solve the above problems. SUMMARY

[0006] To solve the above problems, the present application provides a kind of underwater core drilling debris high-efficiency discharge device and method, by being provided with annular cavity and spiral guide rail of spiral guide channel in the outside of drill bit, combine hollow drill rod and pass into high pressure water flow, make water flow flush debris through water outlet hole, while spiral guide rail rotates and pushes up the wastewater containing debris, solve the problem of difficult to discharge debris and easy to jam drill in deep water environment.

[0007] In order to achieve the above object, the technical scheme of the present application is as follows: a kind of underwater core drilling debris high-efficiency discharge device, including hydraulic drilling machine consisting of power head, drill rod, connecting head, drill bit and diamond matrix, the connecting pipe for connecting water pump is communicated on the power head, the drill rod is provided as hollow structure, the drill rod is communicated with the connecting pipe, the power head outside is equipped with the shell corresponding to the power head, the top of power head is fixedly connected with support plate, the support plate is slidably connected with the inner wall of shell, the top of shell is communicated with delivery pump, the displacement sensor is embedded in the inner top wall of shell, the displacement sensor is signal connected with the controller on the power head, the drill bit is opened with recess on the side close to drill rod, the drill bit is equipped with core channel on the side away from drill rod, the coaxial annular cylinder is fixedly connected on the outer side wall of drill bit, the annular cavity is opened in the annular cylinder, the water outlet hole is opened on the outer side wall of annular cavity away from drill bit, the through hole is opened on the side wall of recess away from drill bit along the circumference of recess, the through hole and annular cavity are communicated, the spiral guide rail is arranged along the circumference on the outer side wall of annular cavity, the spiral direction of spiral guide rail is arranged in the same direction with the rotation direction of drill bit, the outer diameter of diamond matrix is correspondingly arranged with the outer diameter of spiral guide rail.

[0008] The technical principle of the above scheme is as follows: the torque output by the power head is transmitted to the drill bit through the drill rod and the connecting head, which drives the diamond matrix to rotate and break the rock, at the same time, the water pump pressurizes the water flow and outputs it to the inside of the annular cavity through the connecting pipe, the drill rod and the through hole, when the high-pressure water flow is sprayed through the water outlet hole, it produces a radial impact force on the inner wall of the drill hole, and the debris is carried away from the core hole wall by the water flow, and the continuously input high-pressure water flow pushes the wastewater containing debris upward along the gap between the core hole wall and the outer wall of the drill bit, in this process, the spiral guide rail on the outer wall of the drill bit rotates with the drill bit, which generates an axial force on the water flow, pushing the wastewater containing debris to flow upward, the spiral motion of the water flow forms a spiral pump effect, further improving the efficiency of transporting the debris to the hole; the delivery pump transports the water flow inside the shell, which drives the power head to move by pushing the support plate, and then assists the propulsion of the drill bit.

[0009] The above scheme has the following beneficial effects:

[0010] 1、In the scheme, the high-pressure water flow impact combined with the spiral structure further provides upward thrust to the wastewater containing debris, which improves the upward speed and upward thrust of the wastewater containing debris, and avoids the problem that the debris cannot be discharged due to the large water flow resistance of seawater in deep water environment;

[0011] 2. This solution, with its continuous water flow and rapid chip removal via the spiral guide rail, reduces the amount of debris remaining on the core borehole wall, lowers the friction between the drill rod and the borehole wall, and reduces the probability of accidents such as stuck drill or buried drill.

[0012] 3. This solution, by smoothly discharging wastewater containing drill bits, avoids the need to discard samples and drill bits due to stuck drill bits, thereby improving the sampling success rate and reducing losses caused by discarding drill bits.

[0013] Furthermore, the core channel is designed with a conical structure on the side near the diamond matrix, and a retaining spring is installed inside the core channel. The retaining spring is designed with a conical structure corresponding to the side of the core channel near the diamond matrix, and a limit ring is fixedly connected in the middle of the core channel.

[0014] Beneficial effects: The conical core channel and the conical surface of the retaining spring are used to automatically clamp the core sample. When the drilled core sample enters the core channel, the conical surface of the core channel generates a radial force on the retaining spring, causing the retaining spring to contract and clamp the core. When the drill rod is lifted, the friction between the retaining spring and the core overcomes the weight of the core and keeps the sample stable.

[0015] Furthermore, the annular cavity is provided with several guide channels, all of which are spirally distributed, and the two ends of the guide channels are connected to the corresponding inlets and outlets, respectively.

[0016] Beneficial effects: The water, pressurized by the pump, enters the annular cavity and flows in a directional direction as it passes through the guide channel. At the same time, the flow path within the annular cavity and the diameter of the outlet hole decrease from large to small, further increasing the scouring force of the water flow and improving the efficiency of debris discharge.

[0017] Furthermore, the surface of the spiral guide rail is coated with a wear-resistant coating.

[0018] Beneficial effects: The wear-resistant coating reduces the friction between the spiral guide rail and the rock borehole wall, thus reducing the resistance to debris discharge.

[0019] Furthermore, the bottom of the power head is equipped with several telescopic support feet, each with a spring inside along its length, and each with an anti-slip suction cup fixedly connected to its bottom.

[0020] Beneficial effects: When there are strong currents underwater, the drill can be fixed to the rocks by the anti-slip suction cups at the bottom of the telescopic support feet, which prevents divers from being unable to operate the drill stably due to the current, reduces the force required for operators to support the drill, and lowers the difficulty of operation.

[0021] Furthermore, a handle is fixedly connected to one side of the power head.

[0022] Beneficial effect: By using the handle as a stable grip point for the operator, it is easier for the operator to support the drilling rig to maintain stable drilling progress.

[0023] Further, the power head is provided with an operating lever and an operating handle on the side away from the handle.

[0024] Beneficial effects: The torque of the operating handle controls the start-stop and speed regulation functions of the power head, and the operator can use the operating lever to position and support the drilling machine.

[0025] Further, the connecting head is provided with a sealing washer at the connection between the connecting head and the drill rod and the drill bit.

[0026] Beneficial effects: The sealing washer increases the sealing between the drill rod, the drill bit and the connecting head, prevents water leakage at the connection, avoids water pressure drop due to water leakage, and reduces the efficiency of debris discharge.

[0027] Further, the outer wall of the drill rod is provided with a scale mark along its length direction.

[0028] Beneficial effects: The scale mark provides an intuitive drilling depth reference for the operator.

[0029] Further, a method for efficiently discharging debris in underwater core drilling, comprising the following steps:

[0030] S1: Preparation: Move the drilling machine to the underwater drilling operation area, stabilize and fix the drill bit on the rock surface through the telescopic support feet and anti-skid suction cups at the bottom of the power head, connect the connecting pipe on the power head with the water pump, and check the sealing and connection reliability of each part;

[0031] S2: Pre-flushing: Start the water pump to make the water flow into the hollow drill rod through the connecting pipe, then into the annular cavity through the groove and the through hole, and finally sprayed out from the water outlet hole to pre-flush the drilling area and remove loose impurities and sediments on the surface;

[0032] S3: Drilling: Start the power head to rotate the drill rod and drill bit for core drilling, while keeping the water pump continuously supplying water, the water flow forms a spiral flow under the action of the spiral guide groove in the annular cavity, enhancing the flushing force on the inner wall of the drill hole, carrying away the debris generated during drilling, and fixing the core sample through the clasp spring in the core channel; At the same time, under the action of water flow thrust and spiral guide rail, the debris-containing waste water flows upward along the gap between the drill hole inner wall and the drill rod, and finally flows out of the drill hole;

[0033] S4: Sampling is completed: When the drilling reaches the predetermined depth, first close the power head, then stop the water pump, lift the drill rod, and take out the drill bit with the core sample to the water surface, and complete the sampling work.

[0034] Beneficial effects: Core drilling is performed by rotating the drill rod and drill bit through the power head. At the same time, a water pump supplies water, and the water flows through the spiral guide groove in the annular cavity to form a spiral flow that enhances the scouring force and carries away the cuttings. The cuttings-containing wastewater is discharged upward along the gap between the drill pipe and the borehole wall under the thrust of the water flow and the spiral guide rail. The core sample is fixed in the core channel by a retaining spring. The spiral flow and spiral guide rail improve the efficiency of cuttings removal, avoid the problem of cuttings not being able to be removed in deep water environment, reduce the friction between the drill rod and the borehole wall, reduce the probability of stuck drill and buried drill accidents, improve the sampling success rate, and reduce drill bit wear. Attached Figure Description

[0035] Figure 1 This is an isometric view of the hydraulic drilling rig in an embodiment of the efficient debris removal device for underwater core drilling according to the present invention.

[0036] Figure 2 This is a front sectional view of the drill bit in an embodiment of the efficient debris removal device for underwater core drilling according to the present invention.

[0037] Figure 3 This is a frontal sectional view of the outer shell of an embodiment of the underwater core drilling debris efficient removal method of the present invention;

[0038] Figure 4 This is a step diagram illustrating an embodiment of the method for efficient removal of cuttings from underwater core drilling according to the present invention.

[0039] The reference numerals in the accompanying drawings of the instruction manual include: 1. Power head; 2. Drill rod; 3. Connector; 4. Drill bit; 5. Diamond matrix; 6. Connecting pipe; 7. Core channel; 8. Annular cavity; 9. Water outlet; 10. Through port; 11. Spiral guide rail; 12. Snap ring; 13. Limiting ring; 14. Handle; 15. Operating lever; 16. Operating handle; 17. Telescopic support foot; 18. Anti-slip suction cup; 19. Outer shell; 20. Support plate. Detailed Implementation

[0040] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0041] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] The following detailed description illustrates the specific implementation method:

[0044] Example 1:

[0045] As attached Figure 1 As shown: A high-efficiency cuttings removal device for underwater core drilling includes a hydraulic drilling rig consisting of a power head 1, a drill rod 2, a connector 3, a drill bit 4, and a diamond matrix 5. The drill rod 2 has graduated markings along its length on its outer side wall. The power head 1 is connected to a power station via a quick connector. The power station, power head 1, and diamond matrix 5 are designed based on the Stanley HD45 underwater hydraulic drilling rig. A connecting pipe 6 for connecting a water pump is connected to the power head 1. The power head 1 has a connecting channel, one end of which connects to the connecting pipe 6. The drill rod 2 is a hollow structure. The rotary joint connects to the end of the connecting channel away from the connecting pipe 6. During the drilling of core samples of underwater rock, the seawater pressure increases with the water depth, which increases the resistance of the upward flow of the flushing water from the water pump. This causes the combined force of the water flow resistance and the gravity of the water flow to be greater than the water pressure thrust provided by the water pump. The upward flow of the wastewater containing cuttings will slow down or even stop, making it impossible to effectively discharge the drill cuttings from the hole. As the drill bit 4 is fed in, more and more cuttings accumulate at the bottom of the hole, gradually filling the gap between the drill rod 2 and the hole wall, eventually causing the drill to get stuck. After the drill gets stuck, the staff can only abandon the sample and the drill bit 4, resulting in sampling failure.

[0046] To ensure smooth drilling operations below sea level and reduce the risk of stuck drill bits caused by seawater pressure, as per the attached... Figure 1 and attached Figure 2As shown, the drill bit 4 has a groove on the side near the drill rod 2, and a core channel 7 on the side away from the drill rod 2. An annular cylinder is integrally formed on the outer wall of the drill bit 4, and an annular cavity 8, coaxial with the cylinder, is formed inside the annular cylinder. Several water outlet holes 9 are formed on the outer wall of the annular cavity 8 on the side away from the drill bit 4. Several openings 10 are formed along the circumference of the groove on the side wall away from the drill bit 4, and all openings 10 are connected to the annular cavity 8. Several guide grooves are provided inside the annular cavity 8, and these guide grooves are all spirally distributed. The two ends of each guide groove are connected to the corresponding opening 10 and water outlet hole 9, respectively. A spiral guide rail 11 is provided in the circumferential direction (the surface of the spiral guide rail 11 is coated with a wear-resistant coating to reduce the friction between the spiral guide rail 11 and the rock borehole wall and reduce the resistance to debris discharge). The spiral direction of the spiral guide rail 11 is set in the same direction as the rotation direction of the drill bit 4. The outer diameter of the diamond matrix 5 is set to correspond to the outer diameter of the spiral guide rail 11. The core channel 7 is set to a conical structure on the side near the diamond matrix 5. A retaining spring 12 is provided in the core channel 7. The retaining spring 12 is set to a conical structure corresponding to the side of the core channel 7 near the diamond matrix 5. A limit ring 13 is fixedly connected in the middle of the core channel 7.

[0047] As attached Figure 1 and attached Figure 3 As shown, the power head 1 has a corresponding outer shell 19 on its outer side. A support plate 20 is fixedly connected to the top of the power head 1 by bolts. The support plate 20 slides with the inner wall of the outer shell 19 (a sealing ring is provided on the side wall of the support plate 20 along its circumference). A delivery pump for transporting liquid is connected to the top of the outer shell 19. A displacement sensor is embedded in the inner top wall of the outer shell 19. The displacement sensor is connected to the controller signal on the power head 1. The preferred model of the displacement sensor is the Stressert SDW series underwater displacement sensor.

[0048] The specific implementation process is as follows: Before underwater core drilling, the staff first connects the connecting pipe 6 to the power head 1 through a flange, and connects the drill rod 2 and the drill bit 4 through the connecting head 3. Then, the hydraulic drilling rig is transported to the underwater drilling operation area. The power head 1 is connected to the power station through a quick connector. Then, the connecting pipe 6 connected to the power head 1 is connected to the water pump to provide water flow power for subsequent debris discharge. The delivery pump is connected to the top of the outer shell 19. The delivery pump provides a stable water flow into the outer shell 19 to assist in the propulsion of the power head 1, and in turn, assists in the propulsion of the drill bit 4. Compared with relying solely on the staff for propulsion, the difficulty of drilling is reduced.

[0049] At the start of drilling, the power station outputs power to drive the power head 1. The power head 1 transmits torque sequentially through the drill rod 2 and the connector 3 to the drill bit 4, which in turn drives the diamond matrix 5 to rotate. The diamond matrix 5, due to its hardness, begins to break the underwater rock. During this drilling process, the water pump pressure is adjusted according to the hardness of the rock being drilled, thereby regulating the water pressure output from the connecting pipe 6. The displacement of the support plate 20 is monitored in real time by a displacement sensor, and the displacement signal is transmitted to the controller. The controller converts the displacement signal into a moving speed signal for the support plate 20 (calculated based on the time interval and the displacement within the time interval). When the delivery pump propels the power head 1 slowly during drilling, it indicates high drilling pressure, high rock hardness, slow drilling speed, and less debris production. In this case, the controller inside the power head 1 adjusts the water pump to reduce water pressure and avoid water waste. When the delivery pump propels the power head 1 quickly, it indicates low drilling pressure, soft rock, and fast drilling speed, resulting in less debris production. When there is a lot of debris, the controller automatically adjusts the water pump to increase the water pressure, ensuring that the debris can be discharged in time. The water pressurized by the water pump flows through the connecting pipe 6 into the hollow drill rod 2, and then flows through the groove opened on the side of the drill bit 4 near the drill rod 2. Subsequently, the water flows into the annular cavity 8 through the opening 10 on the groove. The water flowing into the annular cavity 8 flows along the spirally distributed guide channels. The spiral structure of the guide channels makes the water flow in a directional manner during the flow process, and at the same time, the channel walls constrain the water flow to prevent it from getting stuck in the annular cavity 8. The turbulent flow also allows for precise flow guidance between the opening and the corresponding water outlet 9 when water is ejected from the outer wall of the annular cavity 8 away from the drill bit 4. At the same time, the flow diameter of the water in the annular cavity 8 and the water outlet 9 decreases from large to small, increasing the ejection pressure of the water flow and generating a stronger radial impact force on the inner wall of the borehole. This washes the drilling debris off the core hole wall, while the continuously input high-pressure water flow pushes the debris-containing wastewater upward along the gap between the core hole wall and the outer wall of the drill bit 4.

[0050] During core drilling, when drill bit 4 has not yet entered the rock, it drills the rock surface. The rotation of drill bit 4 drives the spiral guide rail 11 to rotate, stirring the surrounding water and carrying the drilling debris away from the drilling site through the water flow, preventing debris accumulation and reducing the risk of borehole blockage. When drill bit 4 initially enters the rock, the borehole wall cooperates with the spiral guide rail 11, and high-pressure water flow impacts the bottom of the borehole (where debris is generated), forming wastewater containing debris. At the same time, the upward force of the spiral guide rail 11 discharges the wastewater containing debris. At this time, part of the spiral guide rail 11 is still outside the borehole. When the drill bit 4 drives the spiral guide rail 11 to rotate, the spiral guide rail 11 will still stir the water above the borehole, and the water will drive the discharged wastewater with cuttings to move away from the borehole, so as to avoid the discharged cuttings accumulating at the borehole and blocking the gap between the borehole and the drill bit 4, and increasing the pressure of subsequent cuttings discharge; when the drill bit 4 is fully drilled into the rock, since the cuttings discharged in the early stage do not accumulate at the borehole, and at the same time, through the spiral upward channel formed by the inner wall of the borehole and the spiral guide rail 11, the wastewater with cuttings is kept in a highly efficient upward state under the combined action of the water flow thrust and the spiral guide rail 11, which helps the cuttings to be continuously discharged.

[0051] During the upward flow of the wastewater containing cuttings, the spiral guide rail 11 on the outer wall of the annular cavity 8 will rotate together with the drill bit 4. The rotating spiral guide rail 11 will generate an axial force on the water flow, further pushing the wastewater containing cuttings upward. Moreover, the spiral motion of the water flow will form a spiral pump effect, which improves the efficiency of transporting the cuttings out of the hole. This avoids the problem that the upward flow resistance of the water pump flushing water increases due to the increase of seawater pressure with water depth, which slows down or even stops the upward flow of the wastewater containing cuttings, and makes it impossible to effectively discharge the drill cuttings. This prevents the drilled rock hole bottom from accumulating more and more cuttings, filling the gap between the drill rod 2 and the hole wall, and ultimately causing the drill to get stuck.

[0052] Meanwhile, when the drilled core sample enters the core channel 7, the conical surface of the core channel 7 generates a radial force on the retaining spring 12, causing the retaining spring 12 to contract and clamp the core. The limiting ring 13 in the middle of the core channel 7 restricts the position of the retaining spring 12 to prevent excessive movement. When the drilling reaches the predetermined depth, the operator first shuts off the power head 1, then stops the water pump supply, and slowly raises the drill rod 2. At this time, the friction between the retaining spring 12 and the core overcomes the weight of the core, keeping the sample stable and ensuring that the core sample can be successfully taken out of the water surface to complete the entire sampling work. This avoids the situation where the sample and drill bit 4 are forced to be discarded due to the drill bit getting stuck, which would lead to sampling failure. This improves the sampling success rate and also reduces the equipment wear caused by discarding the drill bit 4.

[0053] Example 2:

[0054] As attached Figure 1As shown, the difference from Embodiment 1 is that the bottom of the power head 1 is provided with several telescopic support feet 17, and each telescopic support foot 17 is provided with a spring along its length. The bottom of each telescopic support foot 17 is fixedly connected to an anti-slip suction cup 18 by bolts. A handle 14 is welded to one side of the power head 1, and an operating rod 15 and an operating handle 16 are provided on the side of the power head 1 away from the handle 14. When there is a large current in the sea, the drill is fixed to the rock by the anti-slip suction cup 18 at the bottom of the telescopic support feet 17. At the same time, different operators cooperate to support the hydraulic drill by using the handle 14 and the operating rod 15 respectively, so as to avoid the diver being unable to operate the drill stably due to the current, reduce the force required for the operator to support the drill, and reduce the difficulty of operation.

[0055] Example 3:

[0056] As attached Figure 2 As shown, the difference from Embodiment 2 is that sealing gaskets are provided at the connection points of the connector 3 with the drill rod 2 and the drill bit 4; the sealing gaskets improve the sealing performance of the connection between the drill rod 2 and the drill bit 4, prevent water from leaking from the connection point, reduce the output water pressure, and reduce the thrust of the water flow on the debris, thus affecting the debris discharge efficiency.

[0057] Example 4:

[0058] As attached Figure 4 As shown, a method for efficient removal of underwater core drilling debris includes the following steps:

[0059] S1: Preparation: Move the drilling rig to the underwater drilling operation area, use the telescopic support foot 17 and anti-slip suction cup 18 at the bottom of the power head 1 to fix the drill bit 4 stably on the rock surface, connect the connecting pipe 6 on the power head 1 to the water pump, and check the sealing and connection reliability of each component.

[0060] S2: Pre-flushing: Start the water pump so that the water flows through the connecting pipe 6 into the hollow drill rod 2, then through the groove and the through-hole 10 into the annular cavity 8, and finally sprays out from the water outlet 9 to pre-flushing the drilling area and removing loose impurities and deposits on the surface.

[0061] S3: Drilling: Start the power head 1 to drive the drill rod 2 and drill bit 4 to rotate for core drilling. At the same time, keep the water pump supplying water continuously. The water flow forms a spiral flow under the action of the spiral guide groove in the annular cavity 8, which enhances the scouring force on the inner wall of the borehole and carries away the drilling debris. The core sample is fixed by the snap ring 12 in the core channel 7. At the same time, the wastewater containing debris flows upward along the gap between the inner wall of the borehole and the drill rod 2 under the thrust of the water flow and the guidance of the spiral guide rail 11, and is finally discharged from the borehole.

[0062] S4: Sampling completed: After drilling reaches the predetermined depth, first turn off the power head 1, then stop the water pump supply, lift the drill rod 2, and take the drill bit 4 with the rock core sample out of the water surface to complete the sampling work.

[0063] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A high-efficiency cuttings removal device for underwater core drilling, comprising a hydraulic drilling rig consisting of a power head (1), a drill rod (2), a connector (3), a drill bit (4), and a diamond matrix (5), characterized in that: The power head (1) is connected to a connecting pipe (6) for connecting a water pump. The drill rod (2) is a hollow structure and is connected to the connecting pipe (6). The power head (1) is provided with a shell (19) corresponding to the power head (1) on the outside. A support plate (20) is fixedly connected to the top of the power head (1). The support plate (20) slides with the inner wall of the shell (19). A delivery pump is connected to the top of the shell (19). A displacement sensor is embedded in the inner top wall of the shell (19). The displacement sensor is connected to the controller signal on the power head (1). The drill bit (4) has a groove on the side near the drill rod (2). The drill bit (4) is away from the drill rod (2). A core channel (7) is provided on the side. An annular cylinder is coaxially fixedly connected to the outer wall of the drill bit (4). An annular cavity (8) coaxial with the annular cylinder is opened inside the annular cylinder. Several water outlet holes (9) are opened on the outer wall of the annular cavity (8) away from the drill bit (4). Several through-holes (10) are opened along the circumference of the groove on the side of the groove away from the drill bit (4). The through-holes (10) are connected to the annular cavity (8). A spiral guide rail (11) is provided along the circumference of the outer wall of the annular cavity (8). The spiral direction of the spiral guide rail (11) is set in the same direction as the rotation direction of the drill bit (4). The outer diameter of the diamond matrix (5) is set in accordance with the outer diameter of the spiral guide rail (11).

2. The efficient underwater core drilling debris removal device according to claim 1, characterized in that: The core channel (7) is set as a conical structure on the side near the diamond matrix (5). A retaining ring (12) is provided inside the core channel (7). The retaining ring (12) is set as a conical structure corresponding to the side of the core channel (7) near the diamond matrix (5). The outer wall is set as a conical surface corresponding to the conical structure. A limit ring (13) is fixedly connected in the middle of the core channel (7).

3. The efficient underwater core drilling debris removal device according to claim 1, characterized in that: The annular cavity (8) is provided with several guide channels, all of which are spirally distributed. The two ends of the guide channels are connected to the corresponding inlet (10) and outlet (9), respectively.

4. The efficient underwater core drilling debris removal device according to claim 1, characterized in that: The surface of the spiral guide (11) is coated with a wear-resistant coating.

5. The efficient underwater core drilling debris removal device according to claim 1, characterized in that: The bottom of the power head (1) is provided with several telescopic support feet (17). The telescopic support feet (17) are provided with springs along their length. The bottom of the telescopic support feet (17) is fixedly connected with anti-slip suction cups (18).

6. The efficient underwater core drilling debris removal device according to claim 5, characterized in that: A handle (14) is fixedly connected to one side of the power head (1).

7. The efficient underwater core drilling debris removal device according to claim 6, characterized in that: The power head (1) has an operating lever (15) and an operating handle (16) on the side away from the handle (14).

8. The efficient underwater core drilling debris removal device according to claim 1, characterized in that: Sealing gaskets are provided at the connection points of the connector (3) with the drill rod (2) and the drill bit (4).

9. The efficient underwater core drilling debris removal device according to claim 1, characterized in that: The outer wall of the drill pipe (2) is marked with scale markings along its length.

10. A method for efficient removal of underwater core drilling debris, operating based on the structure of the efficient underwater core drilling debris removal device as described in any one of claims 1-9, characterized in that, Includes the following steps: S1： Preparation: Move the drilling rig to the underwater drilling operation area, and fix the drill bit (4) to the rock surface by means of the telescopic support foot (17) and anti-slip suction cup (18) at the bottom of the power head (1). Connect the connecting pipe (6) on the power head (1) to the water pump and check the sealing and connection reliability of each component. S2: Pre-flushing: Start the water pump so that the water flows through the connecting pipe (6) into the hollow drill rod (2), then through the groove and the through-hole (10) into the annular cavity (8), and finally sprays out from the water outlet (9) to pre-flushing the drilling area and removing loose impurities and deposits on the surface. S3: Drilling: Start the power head (1) to drive the drill rod (2) and drill bit (4) to rotate for core drilling. At the same time, keep the water pump supplying water continuously. The water flow forms a spiral flow under the action of the spiral guide groove in the annular cavity (8), which enhances the scouring force on the inner wall of the borehole and carries away the cuttings generated during drilling. The core sample is fixed by the snap ring (12) in the core channel (7). At the same time, the wastewater containing cuttings flows upward along the gap between the inner wall of the borehole and the drill rod (2) under the thrust of the water flow and the guidance of the spiral guide rail (11), and is finally discharged from the borehole. S4: Sampling completed: After drilling reaches the predetermined depth, first turn off the power head (1), then stop the water pump supply, lift the drill rod (2), and take the drill bit (4) with the rock core sample out of the water surface to complete the sampling work.

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