A drill bit for opening holes in the hull of a double-layer hull / bottom structure

Abstract

A drill bit for opening holes in the hull of a double-hull / bottom structure, belonging to the technical field of drill bits. The drill bit includes an outer drill bit and an inner drill bit. The inner drill bit is placed inside the outer drill bit and the two are connected by shear pins. Above the outer sawtooth hole saw is connected to an outer tap. Above the outer tap is connected to an outer sealing thread. Above the outer sealing thread is connected to the outer drill bit body, and an outer sealing baffle is provided on the outside of the outer drill bit body. Above the inner sawtooth hole saw is connected to an inner tap. Above the inner tap is connected to an inner sealing thread. Above the inner sealing thread is connected to a central pipe. Sealing devices are provided at the upper parts of the outer drill bit and the inner drill bit. The drill bit of the present invention realizes operations such as opening holes, sealing, and fixing the hull of a double-hull / bottom structure underwater through an uninterrupted step, solves the problems of long process flow and complex equipment structure of existing underwater hole-opening equipment, and can greatly reduce the operation difficulty and operation cost.

Description

Technical Field

[0001] The invention belongs to the technical field of drill bits, and particularly relates to a drill bit for opening holes in the hull of a double-hull / bottom structure ship. Background Art

[0002] In recent years, marine pollution caused by oil leakage from sunken ships has occurred frequently. Oil is a highly polluting chemical substance, and the treatment of oil spills from sunken ships has become an important part of sunken ship salvage work. At present, domestic related equipment manufacturers do not have the technology for opening holes in double hulls / bottoms. Only one foreign company can complete the hole opening of double hulls / bottoms at one time, but the equipment is huge, the equipment structure is complex, the underwater hole opening equipment process flow is long, and the requirements for operators are extremely high. A professional team is needed. Therefore, it only provides services and does not sell equipment, and the service fees are extremely high. Traditional underwater hole opening drill bits cannot achieve operations such as opening holes, sealing, and fixing the double hull / bottom ship hull at one time, greatly increasing the workload of underwater operations. Summary of the Invention

[0003] In order to overcome the above technical problems, the invention provides a drill bit for opening holes in the hull of a double-hull / bottom structure ship. The drill bit of the invention can realize operations such as opening holes, sealing, and fixing the double-hull / bottom structure ship hull underwater through an uninterrupted step, solves the problems of long process flow and complex equipment structure of existing underwater hole opening equipment, and can greatly reduce the operation difficulty and operation cost.

[0004] The invention adopts the following technical scheme:

[0005] A drill bit for opening holes in the hull of a double-hull / bottom structure ship, the drill bit includes an outer drill bit and an inner drill bit. The inner drill bit is placed inside the outer drill bit and the two are connected by shear pins. The outer drill bit includes an outer sawtooth hole saw, an outer tap, an outer sealing thread, an outer sealing baffle, and an outer drill bit body. The outer sawtooth hole saw is connected to the outer tap above, the outer tap is connected to the outer sealing thread above, the outer sealing thread is connected to the outer drill bit body above, and an outer sealing baffle is arranged on the outside of the outer drill bit body. The inner drill bit includes an inner sealing thread, an inner tap, and an inner sawtooth hole saw. The inner sawtooth hole saw is connected to the inner tap above, the inner tap is connected to the inner sealing thread above, the inner sealing thread is connected to a central pipe above, the central pipe is connected to a valve, the valve is connected to a quick connector, and sealing devices are arranged on the upper parts of the outer drill bit and the inner drill bit.

[0006] Furthermore, an inner sealing baffle is arranged on the outside of the central pipe.

[0007] Furthermore, a compression sealing ring is provided in the annulus between the outer drill bit body and the central pipe. An annular gasket is provided above the compression sealing ring, and a barbed pressing ring is provided above the annular gasket. The barbed structure on the outside of the barbed pressing ring matches the barbed structure in the inner control of the outer drill bit body.

[0008] Furthermore, the outer sealing baffle is located at the upper end of the outer sealing thread.

[0009] Furthermore, a sealing gasket is provided at the bottom of the outer sealing baffle.

[0010] The advantages and effects of the present invention are as follows:

[0011] The advantage of the drill bit for opening holes in the hull of a double-layer hull / bottom structure of the present invention is that it can complete operations such as opening holes, sealing, and fixing of the double-layer hull / bottom hull at one time, greatly reducing the workload of underwater operations; it can be applied to hulls with different distances between the inner and outer hulls / bottoms. It solves the problems of long process flow and complex equipment structure of existing underwater hole-opening equipment, and can greatly reduce the operation difficulty and operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of a drill bit for opening holes in the hull of a double-layer hull / bottom structure of the present invention.

[0013] Components in the figure: 1 is the outer serrated hole-opening drill bit, 2 is the outer tap, 3 is the outer sealing thread, 4 is the outer sealing baffle, 5 is the outer drill bit body, 6 is the inner sealing baffle, 7 is the annular gasket, 8 is the central pipe, 9 is the valve, 10 is the quick connector, 11 is the barbed pressing ring, 12 is the compression sealing ring, 13 is the shear pin, 14 is the inner sealing thread, 15 is the inner tap, 16 is the inner serrated hole-opening drill bit, 17 is the sealing gasket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The present invention will be further explained below with reference to the drawings and embodiments.

[0015] A drill bit for opening holes in the hull of a double-layer hull / bottom structure, which consists of two major parts: an outer drill bit and an inner drill bit. The inner drill bit and the outer drill bit are connected by shear pins 13. Above the outer saw-shaped hole saw 1 in the outer drill bit, it is connected to the outer tap 2. Above the outer tap 2, it is connected to the outer sealing thread 3. Above the outer sealing thread 3, it is connected to the outer drill bit body 5. The outside of the outer drill bit body 5 is connected to the outer sealing baffle 4. In the inner drill bit, above the inner saw-shaped hole saw 16, it is connected to the inner tap 15. Above the inner tap 15, it is connected to the inner sealing thread 14. Above the inner sealing thread 14, it is connected to the central pipe 8. The outside of the central pipe 8 is connected to the inner sealing baffle 6. Above it, it is connected to the valve 9. Above the valve 9, it is connected to the quick connector 10. A compression sealing ring 12 is arranged in the annulus between the outer drill bit body 5 and the central pipe 8. An annular gasket 7 is placed above the compression sealing ring 12. A barbed compression ring 11 is placed on the annular gasket 7. The barbed structure on the outside of the barbed compression ring 11 matches the barbed structure in the inner control of the outer drill bit body 5. After the outer drill bit completes hole opening and sealing, the torque between the inner drill bit and the outer drill bit exceeds the yield strength of the shear pins, and the shear pins are cut off to achieve the separation between the inner drill bit and the outer drill bit. After the inner drill bit completes hole opening and sealing, the barbed compression ring 11 is pressed downwards. During the downward movement of the barbed compression ring 11, it locks with the barbed structure of the outer drill bit body and presses the annular gasket 7 to move downwards. The annular gasket 7 presses the compression sealing ring 12 to expand, completing the sealing between the central pipe 8 of the inner drill bit and the outer drill bit, and the hole opening of the double-layer hull / bottom is completed.

[0016] Example 1

[0017] A drill bit for opening holes in the hull of a double - hull / bottom structure relates to a drill bit that can perform operations such as opening holes, sealing, and fixing on the hull of a double - hull / bottom structure underwater in an uninterrupted step. A drill bit for opening holes in the hull of a double - hull ship, used in conjunction with a special underwater hole - opening machine, includes an outer serrated hole - opening drill bit 1, an outer tap 2, an outer sealing thread 3, an outer sealing baffle 4, an outer drill bit body 5, an inner sealing baffle 6, an annular gasket 7, a central tube 8, a valve 9, a quick - connector 10, a barbed compression ring 11, a compression sealing ring 12, a shear pin 13, an inner sealing thread 14, an inner tap 15, and an inner serrated hole - opening drill bit 16. The central tube 8 rotates with the power tong of the underwater hole - opening machine and moves towards the hull in a direction perpendicular to the hole - opening surface. The outer serrated hole - opening drill bit 1 drills a round hole in the outer hull under the action of pressure and torque. The outer tap 2 continues to move with the central tube and drills an internal thread on the inner side of the drilled round hole. The outer sealing thread 3 is connected to the thread tapped by the outer tap 2 during the continuous drilling process. A sealing gasket 17 is provided at the bottom of the outer sealing baffle 4, which forms a second seal by pressing on the outer hull under the action of the tensile force of the thread. After the outer sealing baffle 4 is tightened, the resistance to the central tube 8 rises sharply. Therefore, the torque borne by the shear pin 13 also rises sharply, exceeding its shear yield limit and breaking. After that, the central tube 8, the inner sealing thread 14, the inner tap 15, and the inner serrated hole - opening drill bit 16 continue to feed along the original direction until the inner serrated hole - opening drill bit 16 reaches the inner hull of the ship and drills a round hole. The inner tap 15 continues to feed with the inner serrated hole - opening drill bit 16 and taps an internal thread on the inner layer of the drilled round hole. The inner sealing thread 14 is connected to the tapped internal thread during the continuous feeding process. Subsequently, the inner sealing baffle 6 is tightened on the inner hull of the ship to form a second seal. The barbed compression ring 11 is pressed along the central tube 8 towards the drill bit direction. The barbed compression ring 11 transmits the pressure to the annular gasket 7 and the compression sealing ring 12. The compression sealing ring 12 contracts radially under the action of pressure and seals with the central tube 8 until a seal is formed. The barbed compression ring 11 is locked with the barbed structure of the outer drill bit body 5, and the processes of opening holes, sealing, and fixing are completed. The present invention can complete operations such as opening holes, sealing, and fixing on the double - hull / bottom ship hull at one time, greatly reducing the workload of underwater operations; it can be applied to hulls with different distances between the inner and outer hulls / bottoms of the ship.

Claims

1. A drill bit for opening holes in the hull of a double hull / bottom structure ship, characterized in that: the drill bit includes an outer drill bit and an inner drill bit. The inner drill bit is placed inside the outer drill bit and the two are connected by shear pins (13). The outer drill bit includes an outer sawtooth hole saw (1), an outer tap (2), an outer sealing thread (3), an outer sealing baffle (4), and an outer drill bit body (5). The outer sawtooth hole saw (1) is connected to the outer tap (2) above, the outer tap (2) is connected to the outer sealing thread (3) above, the outer sealing thread (3) is connected to the outer drill bit body (5) above, and an outer sealing baffle (4) is provided on the outside of the outer drill bit body (5); the inner drill bit includes an inner sealing thread (14), an inner tap (15), and an inner sawtooth hole saw (16). The inner sawtooth hole saw (16) is connected to the inner tap (15) above, the inner tap (15) is connected to the inner sealing thread (14) above, the inner sealing thread (14) is connected to the central pipe (8) above, the central pipe (8) is connected to the valve (9), the valve (9) is connected to the quick connector (10), and sealing devices are provided on the upper parts of the outer drill bit and the inner drill bit; an inner sealing baffle (6) is provided on the outside of the central pipe (8); a compression sealing ring (12) is provided in the annular hole between the outer drill bit body (5) and the central pipe (8). An annular gasket (7) is provided above the compression sealing ring (12), a barbed compression ring (11) is provided above the annular gasket (7), and the barbed structure on the outside of the barbed compression ring (11) matches the barbed structure in the inner hole of the outer drill bit body (5).

2. A drill bit for opening holes in the hull of a double hull / bottom structure ship according to claim 1, characterized in that: the outer sealing baffle (4) is located at the upper end of the outer sealing thread (3).

3. A drill bit for opening holes in the hull of a double hull / bottom structure ship according to claim 1, characterized in that: a sealing gasket (17) is provided at the bottom of the outer sealing baffle (4).

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