An underwater drilling device for marine geological exploration

Abstract

The present invention discloses an underwater drilling device for marine geological exploration in the technical field of marine geological exploration, including a drill bit for drilling exploration holes and provided with a through drainage hole; a drive shaft, arranged in a hollow structure, coaxially arranged with the drill bit and fixedly connected to the top of the drill bit; a seal, arranged outside the drive shaft, capable of separating the upper and lower sides of the drill bit after the drill bit drills to the target depth, and seawater and impurities above the seal can no longer flow downward; a temporary storage part, arranged inside the drive shaft, capable of communicating with the drainage hole and used for storing the accumulated liquid below the seal; a core sampling assembly, arranged inside the drive shaft and located on the side of the drainage assembly; a driving part, arranged on the drive shaft, after the seal completes the sealing work; the present invention can greatly improve the sampling efficiency of the drilling device.

Description

Technical Field

[0001] The invention relates to the technical field of marine geological exploration, in particular to an underwater drilling device for marine geological exploration. Background Art

[0002] There are also rich mineral resources in marine geology. Marine geological exploration can provide basic data for the development of marine resources. The purpose of drilling is to sample marine geological rocks. When existing drilling equipment is performing sampling work, the borehole will be filled with mud formed by seawater and particles produced after the upper rock is crushed. In the marine environment, the deeper the detection pit, the more difficult it is to discharge the mud, and the mud will be mixed with rock particles of different depths. When performing sampling operations, the sample will be mixed with upper rock particles, and the mixed rock particles are difficult to screen and process, which will greatly reduce the accuracy of the sample.

[0003] Based on this, the present invention designs an underwater drilling device for marine geological exploration to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide an underwater drilling device for marine geological exploration to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an underwater drilling device for marine geological exploration, comprising a drill bit for drilling exploration holes and having a through drainage hole; a drive shaft, which is configured as a hollow structure, coaxially arranged with the drill bit and fixedly connected to the top of the drill bit; a sealing member, which is arranged on the outside of the drive shaft, and can separate the upper and lower sides of the drill bit after the drill bit drills to the target depth, so that the seawater and impurities above the seal can no longer flow downward; a temporary storage portion, which is arranged inside the drive shaft, can be connected to the drainage hole and is used to store the accumulated liquid below the seal; a core sampling assembly, which is arranged inside the drive shaft and located on the side of the drainage assembly; a driving member, which is arranged on the drive shaft, and after the seal completes the sealing work, the driving member can pump the accumulated liquid in the hole below the seal out of the temporary storage portion for storage, and then drive the core sampling assembly to move to a position docking with the drainage hole, and the core sampling assembly can collect core samples after the drill bit continues to work.

[0006] As a further solution of the present invention, the temporary storage part includes a drainage pipe, which is sealingly and slidably installed on the top of the drill bit and can be connected to the drainage hole; a temporary storage bucket is fixed to the inner wall of the drive shaft, and the bottom end is sealingly and slidably connected to the top of the drainage pipe and can be connected to the drainage pipe.

[0007] As a further solution of the present invention, the core sampling assembly includes a sampling tube, which is arranged on the side of the drainage pipe and fixed relative to the drainage pipe; a funnel, whose wide opening end is fixed to the bottom of the sampling tube and whose narrow opening end is located inside the sampling tube; and a cover plate, which is rotatably installed on the top of the funnel and is used to seal the narrow opening end of the funnel.

[0008] As a further solution of the present invention, the driving member includes an air box installed on the top of the driving shaft; a first air pipe, one end of which is fixedly connected to the air box, and the other end of which passes through the top of the driving shaft and extends to the inside of the driving shaft; a first cylinder body, which passes through the top of the driving shaft and is connected to the first air pipe; a first piston, which is slidably installed in the first cylinder body, the first piston is a hollow structure, and a valve core is fixedly installed inside; a sealing block, which is fixedly connected to the first piston and is used to seal the bottom end of the first air pipe; an air hole, which passes through and is opened on the drill bit and is arranged parallel to the drainage pipe; a second cylinder body, which is fixedly connected to the inner wall of the driving shaft, and a pin that can dock with the valve core is fixedly connected to the top; a second piston, which is slidably installed in the second cylinder body, and a fixed rod is hinged at the bottom end; a push rod, one end of which is hinged to the fixed rod, and the other end of which is hinged to the sampling tube; a third piston, which is slidably installed in the temporary storage barrel, and is fixed to the first piston by a first steel rope, and the downward movement of the first piston can drive the third piston to move upward by the first steel rope.

[0009] As a further scheme of the present invention, the air box is composed of two symmetrically arranged and relatively rotatable cylinders, the lower cylinder is fixedly connected to the drive shaft, and the first air pipe is fixedly connected to the lower cylinder; the sealing member includes a protective cylinder, which is rotatably connected to the drive shaft and coaxially arranged with the drill bit; the outer circumferential side wall diameter of the protective cylinder is smaller than the bore diameter of the drill bit; the upper cylinder is fixedly connected to the protective cylinder; an inflatable sealing ring is fixedly connected to the outer side of the protective cylinder near one end of the drill bit, and the inflatable sealing ring is fixedly connected to the upper cylinder through a second air pipe; an annular baffle is rotatably installed in the air box, and two air inlets are provided on the annular baffle, and the two air inlets are staggered and can be aligned with the first air pipe and the second air pipe respectively; a driving component for driving the annular baffle to rotate is also provided on the top of the air box.

[0010] As a further solution of the present invention, the driving assembly includes a driving wheel for driving the annular baffle to rotate, and the driving wheel is transmission-connected to a first motor.

[0011] As a further solution of the present invention, an annular slide groove is provided on the protective tube; a support block is elastically slidably installed in the drive shaft, and the support block can slide along the radial direction of the drive shaft, and can also make circular motion along the slide groove driven by the drive shaft; the support block is fixedly connected to the fixed rod through a second steel rope.

[0012] As a further solution of the present invention, a plurality of sampling cylinders are arranged in a circumferential array about the drive shaft. Each of the plurality of sampling cylinders is fixedly connected with a telescopic rod, and a gear ring is fixedly connected to the ends of the plurality of telescopic rods away from the sampling cylinders. The gear ring meshes with a gear, and the gear is drivingly connected to a second motor. A clamping block is fixedly connected to the sampling cylinder, and a clamping groove capable of being clamped with the clamping block is formed in the drain pipe. When the sampling cylinder rotates around the drive shaft, the clamping block can be clamped with the clamping groove, and when the drain pipe moves horizontally, the sampling cylinder and the drain pipe can be relatively fixed.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the settings of the sealing member, the temporary storage part, the core sampling assembly and the driving member, when the drill bit drills down to the target area for sampling, the sealing member can separate the mud in the drill hole and simultaneously seal the drill hole. Then the driving member can press a small amount of mud below the sealing member into the temporary storage part for temporary storage. Thus, it can be ensured that only rock sample particles exist in the area below the sealing member during sampling, and it can be avoided that the samples collected by the core sampling assembly are doped with rock particles of other rock layers, which can greatly improve the accuracy of the samples. After sampling is completed, the mud in the temporary storage part can be automatically discharged back into the drill hole below the sealing member. Then the sealing member cancels the sealing of the drill hole, and the drill holes on both sides of the sealing member are communicated, and the drill hole is always kept filled with seawater, which can avoid the sudden influx of seawater into the drill hole and minimize the impact of the pressure generated by the seawater on the drilling equipment.

[0014] Through the setting of a plurality of sampling cylinders, the drilling equipment can continuously sample rocks at different depths, and the samples collected each time can ensure accuracy, and the sampling depth does not affect the accuracy of the samples, which can greatly reduce the sampling difficulty and improve the sampling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 is Figure 2 the partial enlarged view at A in Figure 4 is Figure 2 the partial enlarged view at B in Figure 5 is a schematic cross-sectional view of the air box structure of the present invention; Figure 6 is a schematic cross-sectional view of the drive shaft and the protective cylinder structure of the present invention; Figure 7 is a schematic diagram of the positional relationship and connection relationship between a plurality of sampling cylinders and the drain pipe of the present invention; Figure 8 Schematic cross-sectional view of the drive shaft structure of the present invention.

[0016] In the accompanying drawings, the list of components represented by each reference numeral is as follows: 1 - Drill bit, 2 - Drain hole, 3 - Drive shaft, 4 - Seal, 5 - Temporary storage part, 6 - Core sampling assembly, 7 - Drain pipe, 8 - Temporary storage barrel, 9 - Sampling cylinder, 10 - Funnel, 11 - Cover plate, 12 - Air box, 13 - First air pipe, 14 - First cylinder block, 15 - First piston, 16 - Valve core, 17 - Sealing block, 18 - Air hole, 19 - Second cylinder block, 20 - Thumbnail, 21 - Second piston, 22 - Fixed rod, 23 - Push rod, 24 - Third piston, 25 - First steel wire rope, 26 - Protective cylinder, 27 - Inflatable sealing ring, 28 - Second air pipe, 29 - Annular baffle, 30 - Air inlet, 31 - Exhaust port, 32 - Driving wheel, 33 - First motor, 34 - Slide groove, 35 - Support block, 36 - Second steel wire rope, 37 - Gear ring, 38 - Gear, 39 - Second motor, 40 - Clamping block, 41 - Card slot, 42 - Expansion rod. Specific embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1-8 , the present invention provides a technical solution: an underwater drilling device for marine geological exploration, including a drill bit 1, a drive shaft 3, a seal 4, a temporary storage part 5, a core sampling assembly 6 and a driving member; the drill bit 1 is used for drilling exploration holes and is provided with a through drain hole 2; the drive shaft 3 is arranged as a hollow structure, coaxially arranged with the drill bit 1 and fixedly connected to the top of the drill bit 1; the seal 4 is arranged outside the drive shaft 3, and can separate the upper and lower sides of the drill bit 1 after the drill bit 1 drills to the target depth, and the seawater and impurities above the seal 4 can no longer flow downward; the temporary storage part 5 is arranged inside the drive shaft 3, can communicate with the drain hole 2 and is used for storing the accumulated liquid below the seal 4; the core sampling assembly 6 is arranged inside the drive shaft 3 and is located on the side of the drain assembly; the driving member is arranged on the drive shaft 3. After the seal 4 completes the sealing work, the driving member can press the accumulated liquid in the hole below the seal 4 out of the temporary storage part 5 for storage, and then drive the core sampling assembly 6 to move to a position where it is docked with the drain hole 2. After the drill bit 1 continues to work, the core sampling assembly 6 can collect core samples.

[0019] First, the staff members drive the dedicated exploration ship to carry the drilling equipment to the target exploration area, and then drop the drilling equipment to the seabed in the target area through a pipeline; then the staff members can operate the drive shaft 3 on the exploration ship to drive the drill bit 1 to work. During the drilling process of the drill bit 1, seawater can be poured into the drill hole to cool the drill bit 1; after the drill bit 1 moves to the target depth, the seal 4 can divide the drill hole into two areas with the top of the drill bit 1 as the reference plane. The area below the seal 4 is in a closed state, and then the driving member can press the mud in the area below the seal 4 into the temporary storage part 5 through the drain hole 2 by air pressure for storage. At this time, the drill hole below the seal 4 is in a clean state; then the core sampling assembly 6 moves to directly above the drain hole 2; subsequently, the drill bit 1 can drill down a short distance. At this time, the drill bit 1 works briefly, and the drilling depth is relatively shallow. Without the cooling of seawater, there will be no great impact. Rock sample particles will enter the core sampling assembly 6 through the drain hole 2 for storage; after the sampling is completed, the driving member first drives the core sampling assembly 6 and the temporary storage part 5 to move back to Figure 2 the initial position shown, and the mud in the temporary storage part 5 is discharged into the drill hole below the seal 4; then the seal 4 cancels the seal of the drill hole, and the drill holes on both sides of the seal 4 are connected. The drill hole is always filled with seawater, which can prevent seawater from suddenly pouring into the drill hole and minimize the impact of the pressure generated by seawater on the drilling equipment.

[0020] Specifically, as Figure 2 shown, the temporary storage part 5 includes a drain pipe 7 and a temporary storage barrel 8; the drain pipe 7 is hermetically and slidably installed on the top of the drill bit 1 and can communicate with the drain hole 2; the temporary storage barrel 8 is fixedly connected to the inner wall of the drive shaft 3, and the bottom end is hermetically and slidably connected to the top end of the drain pipe 7 and can communicate with the drain pipe 7.

[0021] After the seal 4 closes the area between it and the drill bit 1, the driving member can press a small amount of mud in the area below the seal 4 into the temporary storage barrel 8 through the drain hole 2 and the drain pipe 7 for storage.

[0022] Specifically, as Figure 2 and Figure 3 shown, the core sampling assembly 6 includes a sampling cylinder 9, a funnel 10 and a cover plate 11; the sampling cylinder 9 is arranged on the side of the drain pipe 7 and is relatively fixed to the drain pipe 7; the wide-open end of the funnel 10 is fixed to the bottom of the sampling cylinder 9, and the narrow-open end is located inside the sampling cylinder 9; the cover plate 11 is rotatably installed on the top of the funnel 10 and is used to seal the narrow-open end of the funnel 10.

[0023] After a small amount of mud in the area below the seal 4 is pressed into the temporary storage bucket 8, the driving member can drive the sampling cylinder 9 and the drain pipe 7 to move synchronously to the right. The top end of the drain pipe 7 always keeps in close contact with the bottom end of the temporary storage bucket 8, and the mud in the temporary storage bucket 8 will not overflow; until the sampling cylinder 9 is aligned with the drain hole 2; when the drill bit 1 drills the target sample subsequently, rock particles can enter the drain hole 2, and the rock particles can lift the cover plate 11 and then move into the sampling cylinder 9; after the sampling is completed, after the sampling cylinder 9 moves left to return to the initial position, the cover plate 11 will close the funnel 10 under the action of gravity.

[0024] Specifically, as Figures 2-4 shown, the driving member includes an air box 12, a first air pipe 13, a first cylinder body 14, a first piston 15, a sealing block 17, an air hole 18, a second cylinder body 19, a second piston 21, a push rod 23 and a third piston 24; the air box 12 is installed on the top of the driving shaft 3; one end of the first air pipe 13 is fixedly communicated with the air box 12, and the other end penetrates through the top of the driving shaft 3 and extends into the driving shaft 3; the first cylinder body 14 is installed through the top of the driving shaft 3 and communicated with the first air pipe 13; the first piston 15 is slidably installed in the first cylinder body 14, the first piston 15 is a hollow structure, and a valve core 16 is fixedly installed inside; the sealing block 17 is fixedly connected with the first piston 15 and used for sealing the bottom end of the first air pipe 13; the air hole 18 is penetrated and opened on the drill bit 1 and arranged in parallel with the drain pipe 7; the second cylinder body 19 is fixedly connected to the inner wall of the driving shaft 3, and a thimble 20 capable of docking with the valve core 16 is fixedly connected to the top end; the second piston 21 is slidably installed in the second cylinder body 19, and a fixed rod 22 is hinged to the bottom end; one end of the push rod 23 is hinged to the fixed rod 22, and the other end is hinged to the sampling cylinder 9; the third piston 24 is slidably installed in the temporary storage bucket 8 and is fixed to the first piston 15 through a first steel cable 25, and the downward movement of the first piston 15 can drive the third piston 24 to move upward through the first steel cable 25.

[0025] When the drill bit 1 moves down to the target area and the seal 4 seals the area between it and the drill bit 1; the staff can press air into the air box 12 through the air inlet pipe at the top of the air box on the exploration ship by means of an air compressor; it should be noted that, as Figure 4As shown, in the initial state, the bottom end of the first air pipe 13 is blocked by the sealing block 17, the air pressure in the internal space of the drive shaft 3 remains stable, and the mud cannot flow into the drive shaft 3 from the air hole 18; the air in the air box 12 will enter the first cylinder 14 through the first air pipe 13, and the first piston 15 will move downward under the action of the air pressure. The first piston 15 can drive the third piston 24 to move upward through the first steel rope 25, and the air pressure in the area below the third piston 24 in the temporary storage barrel 8 decreases; at the same time, the first piston 15 will also drive the sealing block 17 to move downward synchronously, and the first air pipe 15 is connected to the internal space of the drive shaft 3, and the compressed air will enter the internal space of the drive shaft 3 from the first air pipe 15, and the air pressure in the internal space of the drive shaft 3 will gradually increase; under the action of the pressure difference, the mud in the area below the seal 4 will be pressed into the temporary storage barrel 8 for storage; when the first piston 15 moves downward After moving to the bottom, the third piston 24 moves upward to the highest position. At this time, a small amount of mud in the area below the seal 4 completely enters the temporary storage barrel 8, the valve core 16 on the first piston 15 is connected to the ejector pin 20, the first cylinder body 14 and the second cylinder body 19 are connected, and then the compressed air can enter the second cylinder body 19 through the internal hole of the first piston 15 and the valve core 16. At this time, the second piston 21 starts to move downward under the action of air pressure. The second piston 21 can drive the top of the push rod 23 to move downward through the fixed rod 22, and the bottom end of the push rod 23 will drive the sampling tube 9 and the drainage pipe 7 to move synchronously to the right until the sampling tube 9 moves to the top of the drainage hole 2; after the sampling is completed, the air compressor will extract the air in the drive shaft 3 to restore the air pressure in the drive shaft 3 to the initial state, and then the drainage pipe 7 and the sampling tube 9 can return to the initial position under the elastic force of the spring.

[0026] Specifically, Figure 2 , Figure 4 and Figure 5 As shown, the air box 12 is composed of two symmetrically arranged and relatively rotatable cylinders 25, the lower cylinder 25 is fixedly connected to the drive shaft 3, and the first air pipe 13 is fixedly connected to the lower cylinder 25; the sealing member 4 includes a protective cylinder 26, which is rotatably connected to the drive shaft 3 and coaxially arranged with the drill bit 1; the outer circumferential side wall diameter of the protective cylinder 26 is smaller than the drilling diameter of the drill bit 1; the upper cylinder 25 is fixedly connected to the protective cylinder 26; an inflatable sealing ring 2 is fixedly connected to the outer side of the protective cylinder 26 near the drill bit 1 7. The inflatable sealing ring 27 is fixedly connected to the upper cylinder 25 through the second air pipe 28; an annular baffle 29 is rotatably installed in the air box 12, and two air inlets 30 are provided on the annular baffle 29. The two air inlets 30 are staggered and can be aligned with the first air pipe 13 and the second air pipe 28 respectively; a driving assembly for driving the annular baffle 29 to rotate is also provided on the top of the air box 12; the driving assembly includes a driving wheel 32 for driving the annular baffle 29 to rotate, and the driving wheel 32 is transmission-connected to a first motor 33.

[0027] The lower cylinder body 25 can rotate synchronously with the driving shaft 3. In the initial state, the upper air inlet 30 is aligned with the second air pipe 28, and the lower air inlet 30 is offset from the first air pipe 13. When the air compressor starts to work, air first enters the inflatable sealing ring 27 from the upper air inlet 30 through the second air pipe 28. After the inflatable sealing ring 27 expands, its outer ring can be closely attached to the drill hole, and the drill hole area below the inflatable sealing ring 27 is closed. Then, the first motor 33 drives the annular baffle 29 to rotate through the driving wheel 32, so that the upper air inlet 30 is offset from the second air pipe 28, and the lower air inlet 30 is aligned with the first air pipe 13. The inflatable sealing ring 27 remains in the expanded state and is closely attached to the drill hole. Then, the air compressed by the air compressor can enter the first air pipe 13 from the lower air inlet 30.

[0028] Specifically, as Figure 6 shown, an annular sliding groove 34 is formed on the protective cylinder 26; a support block 35 is elastically and slidably installed in the driving shaft 3. The support block 35 can slide along the radial direction of the driving shaft 3, and at the same time, it can also make a circular motion along the sliding groove 34 driven by the driving shaft 3; the support block 35 is fixedly connected to the fixed rod 22 through the second steel wire rope 36.

[0029] The protective cylinder 26 is rotationally connected to the driving shaft 3. The protective cylinder 26 can protect the driving shaft 3. When the inflatable sealing ring 27 is not working, the driving shaft 3 can drive the protective cylinder 26 to move downward through the support block 35; when sampling work needs to be carried out, after the inflatable sealing ring 27 expands, the top of the push rod 23 moves downward and can drive the support block 35 to slide into the driving shaft 3 through the second steel wire rope 36. The support block 35 disengages from the sliding groove 34. When the drill bit 1 drills downward a short distance subsequently, the protective cylinder 26 and the inflatable sealing ring 27 remain stationary. The inflatable sealing ring 27 can remain stationary and be closely attached to the inner wall of the drill hole after expansion, which can reduce the damage to the inflatable sealing ring 27.

[0030] Specifically, as Figure 7 shown, a plurality of sampling cylinders 9 are arranged in a circular array about the driving shaft 3. Each of the plurality of sampling cylinders 9 is fixedly connected with a telescopic rod 31. One ends of the plurality of telescopic rods 31 far from the sampling cylinders 9 are commonly fixedly connected with a gear ring 37; the gear ring 37 meshes with a gear 38, and the gear 38 is drivingly connected with a second motor 39; a clamping block 40 is fixedly connected to the sampling cylinder 9, and a clamping groove 41 capable of being clamped with the clamping block 40 is formed on the liquid discharge pipe 7; when the sampling cylinder 9 rotates around the driving shaft 3, the clamping block 40 can be clamped with the clamping groove 41. When the liquid discharge pipe 7 moves horizontally, the sampling cylinder 9 and the liquid discharge pipe 7 can be relatively fixed.

[0031] There are multiple sampling cylinders 9 provided, and the drilling equipment can continuously sample rocks at different depths. After completing the sampling of rocks at one depth, after the sampling cylinder 9 moves back to the initial position, the second motor 39 drives the gear ring 37 to rotate a certain angle through the gear 38, so that the clamping block 40 on the next sampling cylinder 9 rotates to a state where it is clamped with the clamping groove 41, and then the drill bit 1 can drill down to the next sampling position again.

Claims

1. An underwater drilling device for marine geological exploration, characterized in that: include A drill bit (1) for drilling a detection hole and having a through-hole for drainage (2); The drive shaft (3) is configured as a hollow structure, is coaxially arranged with the drill bit (1) and is fixedly connected to the top of the drill bit (1); A sealing member (4) is arranged on the outside of the driving shaft (3) and is capable of separating the upper and lower sides of the drill bit (1) after the drill bit (1) has drilled to a target depth, so that seawater and impurities above the sealing member (4) cannot flow downwards; A temporary storage portion (5), arranged inside the drive shaft (3), capable of being in communication with the liquid discharge hole (2) and used for storing the accumulated liquid below the sealing element (4); A core sampling assembly (6) is arranged inside the drive shaft (3) and located on the side of the liquid discharge assembly; The driving member is arranged on the driving shaft (3). After the sealing member (4) completes the sealing work, the driving member can press the accumulated fluid in the hole below the sealing member (4) out and store it in the temporary storage part (5), and then drive the core sampling assembly (6) to move to a position connected with the drainage hole (2). After the drill bit (1) continues to work, the core sampling assembly (6) can collect the core sample.

2. The underwater drilling equipment for marine geological exploration according to claim 1, characterized in that: The temporary storage unit (5) comprises A drainage pipe (7) is sealingly and slidably mounted on the top of the drill bit (1) and is capable of communicating with the drainage hole (2); The temporary storage barrel (8) is fixedly connected to the inner wall of the driving shaft (3), and the bottom end is sealingly slidably connected to the top end of the liquid discharge pipe (7) and can be communicated with the liquid discharge pipe (7).

3. The underwater drilling equipment for marine geological exploration according to claim 2, characterized in that: The core sampling assembly (6) comprises A sampling tube (9) is arranged on the side of the liquid discharge pipe (7) and is fixed relative to the liquid discharge pipe (7); A funnel (10), wherein the wide end of the opening is fixed to the bottom of the sampling tube (9), and the narrow end of the opening is located inside the sampling tube (9); The cover plate (11) is rotatably mounted on the top of the funnel (10) and is used to seal the narrow end of the opening of the funnel (10).

4. The underwater drilling equipment for marine geological exploration according to claim 3 is characterized in that: The driving member includes An air box (12) mounted on top of the drive shaft (3); A first air pipe (13), one end of which is fixedly connected to the air box (12), and the other end of which passes through the top of the drive shaft (3) and extends into the interior of the drive shaft (3); A first cylinder body (14) is installed through the top of the driving shaft (3) and is in communication with the first air pipe (13); A first piston (15) is slidably mounted in the first cylinder body (14); the first piston (15) is a hollow structure, and a valve core (16) is fixedly mounted inside the first piston; A sealing block (17) fixedly connected to the first piston (15) and used to seal the bottom end of the first air pipe (13); An air hole (18) is formed through the drill bit (1) and is arranged in parallel with the drainage pipe (7); The second cylinder body (19) is fixedly connected to the inner wall of the drive shaft (3), and a top end thereof is fixedly connected to a pin (20) capable of docking with the valve core (16); A second piston (21) is slidably mounted in the second cylinder body (19) and has a fixed rod (22) hingedly connected to its bottom end; A push rod (23), one end of which is hinged to the fixed rod (22), and the other end of which is hinged to the sampling tube (9); The third piston (24) is slidably mounted in the temporary storage barrel (8) and is fixed to the first piston (15) via a first steel rope (25). When the first piston (15) moves downward, the third piston (24) can be driven to move upward via the first steel rope (25).

5. The underwater drilling equipment for marine geological exploration according to claim 4, characterized in that: The air box (12) is composed of two symmetrically arranged and relatively rotatable cylinders (25), the lower cylinder (25) is fixedly connected to the drive shaft (3), and the first air pipe (13) is fixedly connected to the lower cylinder (25); the sealing member (4) includes a protective cylinder (26), the protective cylinder (26) is rotatably connected to the drive shaft (3) and is coaxially arranged with the drill bit (1); the outer circumferential side wall diameter of the protective cylinder (26) is smaller than the drilling diameter of the drill bit (1); the upper cylinder (25) is fixedly connected to the protective cylinder (26); the protective cylinder (26) is An inflatable sealing ring (27) is fixedly connected to one end of the outer side of the cylinder (26) near the drill bit (1), and the inflatable sealing ring (27) is fixedly connected to the upper cylinder (25) through the second air pipe (28); an annular baffle (29) is rotatably installed in the air box (12), and two air inlets (30) are provided on the annular baffle (29), and the two air inlets (30) are staggered and can be aligned with the first air pipe (13) and the second air pipe (28) respectively; a driving component for driving the annular baffle (29) to rotate is also provided on the top of the air box (12).

6. The underwater drilling equipment for marine geological exploration according to claim 5, characterized in that: The driving assembly comprises a driving wheel (32) for driving the annular baffle (29) to rotate, and the driving wheel (32) is drivingly connected to a first motor (33).

7. The underwater drilling equipment for marine geological exploration according to claim 5, characterized in that: The protective tube (26) is provided with an annular sliding groove (34); a support block (35) is elastically slidably installed in the driving shaft (3); the support block (35) can slide along the radial direction of the driving shaft (3) and can also make a circular motion along the sliding groove (34) driven by the driving shaft (3); the support block (35) is fixedly connected to the fixing rod (22) via a second steel rope (36).

8. The underwater drilling equipment for marine geological exploration according to claim 3 is characterized by: The sampling barrels (9) are arranged in a plurality distributed in a circular array about the drive shaft (3); the plurality of sampling barrels (9) are all fixedly connected to telescopic rods (31); the ends of the plurality of telescopic rods (31) away from the sampling barrel (9) are commonly fixedly connected to a gear ring (37); the gear ring (37) is meshed with a gear (38), and the gear (38) is transmission-connected to a second motor (39); a clamping block (40) is fixedly connected to the sampling barrel (9), and a clamping groove (41) capable of clamping with the clamping block (40) is provided on the liquid discharge pipe (7); when the sampling barrel (9) rotates around the drive shaft (3), the clamping block (40) can be clamped with the clamping groove (41); when the liquid discharge pipe (7) moves horizontally, the sampling barrel (9) and the liquid discharge pipe (7) can be relatively fixed.

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