Impact-resistant underwater bearing head

Abstract

The invention provides an impact-resistant underwater load-bearing head, and relates to the technical field of dragging and hoisting systems, the impact-resistant underwater load-bearing head comprises a load-bearing base and a load-bearing shell, one end of the load-bearing shell is movably mounted with the load-bearing base, the center of the interior of the load-bearing base is used for allowing a cable to pass through, one end of the cable extends into the load-bearing shell, and the other end of the cable extends into the load-bearing shell. A cable core in the mooring rope penetrates through the bearing shell and is sealed, one end of the mooring rope is stripped to form in-cable aramid fiber, and the in-cable aramid fiber enters the interior of the bearing shell and is subjected to epoxy encapsulation; a plurality of sets of oil cylinder mounting holes are formed in the edge of the interior of the force bearing base, double buffering cylinder pieces are arranged in the oil cylinder mounting holes, and the output ends of the double buffering cylinder pieces are connected with the bearing shell. The impact resistance index requirement is met, repeated impact can be borne, the problem that the impact resistance of the underwater bearing head is poor is solved, the impact resistance of the bearing head under the unexpected condition is improved, and the reliability of the underwater bearing head in the complex environment is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of towing and lowering systems, and particularly to an impact-resistant underwater load-bearing head. Background Art

[0002] Underwater load-bearing heads are mostly used in underwater towing systems and lowering systems. They are intermediate transition components for connecting towing cables and equipment load-bearing structures. They are key load-bearing components in the system and are also relatively easy to fail. One end of the underwater load-bearing head is fixed to an underwater device, and the other end is connected to the towing cable. When working, the tension generated by the underwater device is transmitted to the towing cable. During the use of the underwater load-bearing head, not only the tension function needs to be realized, but also reliable watertight requirements need to be met. However, the use environment of the underwater load-bearing head is mostly in the sea, the environment is relatively complex, there are many unexpected situations at sea, and the load-bearing head often bears impact forces. Repeated impacts will lead to the failure of the load-bearing head seal, damage to the load-bearing structure, and even cause serious situations such as accidental fracture of the load-bearing head and loss of equipment. At present, the method to improve the impact resistance of the load-bearing head is to increase the tension index of the load-bearing head and the towing cable and increase the safety factor, which is basically achieved by increasing the quantity of tensile materials (such as aramid) used inside the submarine cable, resulting in an increase in the outer diameter and weight of the submarine cable. Further, it may affect the normal operation of other operating equipment in the system. At the same time, a large safety redundancy will also bring an increase in cost and waste of materials. Therefore, the present invention proposes an impact-resistant underwater load-bearing head to solve the problems existing in the prior art. Summary of the Invention

[0003] In view of the above problems, the present invention proposes an impact-resistant underwater load-bearing head, which solves the problem of poor impact resistance and improves the reliability of the load-bearing head in a harsh environment.

[0004] To achieve the object of the present invention, the present invention is realized through the following technical solutions: An impact-resistant underwater load-bearing head includes a load-bearing base and a load-bearing housing. One end of the load-bearing housing is movably installed on the load-bearing base. The center inside the load-bearing base is used for a cable to pass through, and one end of the cable extends into the load-bearing housing. The cable core inside the cable passes through the load-bearing housing and is sealed. One end of the cable is peeled into aramid in the cable, and the aramid in the cable extends into the interior of the load-bearing housing and is epoxy potted. A number of groups of oil cylinder mounting holes are provided at the edge inside the load-bearing base, and a double buffer cylinder member is provided inside the oil cylinder mounting holes. The output end of the double buffer cylinder member is connected to the load-bearing housing.

[0005] Further improvement lies in that: at least four groups of oil cylinder mounting holes are provided, and the four groups of oil cylinder mounting holes are arranged at equal angles around the center of the load-bearing base.

[0006] A further improvement lies in that: the double buffer cylinder member includes an oil cylinder and a piston rod. The oil cylinder is threadedly installed inside the oil cylinder mounting hole. The piston rod is movably inserted inside the oil cylinder. One end of the oil cylinder is provided with an oil cylinder cover. One end of the piston rod passes through the oil cylinder cover and is threadedly connected to the load-bearing housing.

[0007] A further improvement lies in that: a heavy-duty spring is connected between one end inside the piston rod and the oil cylinder, and the inside of the oil cylinder is filled with hydraulic oil. A throttle passage is left between the piston rod and the inner side wall of the oil cylinder.

[0008] A further improvement lies in that: a first O-ring is provided at the edge of one end of the oil cylinder. The oil cylinder cover and the oil cylinder are sealed through the first O-ring. A second O-ring is provided inside the oil cylinder cover. The oil cylinder cover and the piston rod are sealed through the second O-ring.

[0009] A further improvement lies in that: a third O-ring is provided at one end outside the load-bearing housing, and at least two groups of the third O-rings are provided. The load-bearing housing and the load-bearing base adopt a tolerance zone fit of shaft and hole and are sealed through the third O-ring.

[0010] A further improvement lies in that: a cavity is provided inside the load-bearing housing, and the inside of the cavity is filled with epoxy resin. The aramid in the cable extends into the inside of the cavity and is adhesively sealed through the epoxy resin.

[0011] A further improvement lies in that: a sealing end cover is threadedly installed at one end of the load-bearing housing. The cable core passes through the center of the sealing end cover.

[0012] A further improvement lies in that: a vulcanized body is provided at one end of the sealing end cover. The cable core passes through the center of the vulcanized body. The vulcanized body seals the sealing end cover and the cable core through vulcanization.

[0013] A further improvement lies in that: a fourth O-ring is provided at one end outside the load-bearing housing. The sealing end cover and the load-bearing housing are sealed through the fourth O-ring.

[0014] The beneficial effects of the present invention are: 1. In the present invention, a double buffer cylinder is connected between the load-bearing base and the load-bearing housing. When a large impact force is applied, the load-bearing housing drives the piston rod to move into the oil cylinder, which can effectively reduce the intensity of the impact force. And since the oil cylinder is a closed space and there is a small gap (throttle passage) between the piston rod and the oil cylinder, when the piston rod presses down, the hydraulic oil passes through the throttle passage, thus generating a large flow resistance. The flow resistance and the elastic force of the heavy-duty spring together resist the impact force. When the impact force disappears, the elastic force of the heavy-duty spring can restore the piston rod to the normal working position, achieving the impact resistance index requirements, enabling a design that can withstand repeated impacts, solving the problem of poor impact resistance of the underwater load-bearing head, improving the impact resistance of the load-bearing head in case of accidents, and enhancing the reliability of the underwater load-bearing head in complex environments.

[0015] 2. The present invention adopts a vulcanization and O-ring sealing structure on multiple components, achieving the sealing between the submarine cable and metal parts, as well as the sealing between metal parts, and realizing the overall sealing function of the underwater load-bearing head.

[0016] 3. The installation between the load-bearing housing and the load-bearing base in the present invention adopts a tolerance zone fit of the shaft and hole, so that during the movement of the load-bearing housing, the axis remains stable and does not shift, ensuring the stable operation of the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic diagram of the double buffer cylinder of the present invention.

[0018] Wherein: 1. Load-bearing base; 2. Load-bearing housing; 3. Cable; 4. Cable core; 5. Aramid in the cable; 6. Oil cylinder installation hole; 7. Oil cylinder; 8. Piston rod; 9. Heavy-duty spring; 10. Oil cylinder cover; 11. Hydraulic oil; 12. Throttle passage; 13. First O-ring; 14. Second O-ring; 15. Third O-ring; 16. Epoxy resin; 17. Sealing end cover; 18. Vulcanized body; 19. Fourth O-ring. DETAILED DESCRIPTION OF THE INVENTION

[0019] To deepen the understanding of the present invention, the following will further elaborate on the present invention in combination with embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

[0020] Embodiment 1 According to Figure 1 、 2As shown in the figure, this embodiment proposes an impact-resistant underwater load-bearing head, which includes a load-bearing base 1 and a load-bearing housing 2. One end of the load-bearing housing 2 is movably installed on the load-bearing base 1. The center inside the load-bearing base 1 is used for a cable 3 to pass through, and one end of the cable 3 extends into the load-bearing housing 2. The cable core 4 inside the cable 3 passes through the load-bearing housing 2 and is sealed. One end of the cable 3 is peeled into aramid in the cable 5, and the aramid in the cable 5 extends into the load-bearing housing 2 and is epoxy potted; A number of groups of oil cylinder mounting holes 6 are provided at the edge inside the load-bearing base 1, and a double buffer cylinder is provided inside the oil cylinder mounting holes 6. The output end of the double buffer cylinder is connected to the load-bearing housing 2. On the premise of large tensile force and high water pressure, an impact-resistant design is realized, with the characteristics of strong impact resistance, large bearing tensile force (working tensile force 50kN, breaking force ≥200kN), and deep working water pressure (≥10Mpa). Compared with existing products, double buffer cylinders and related connection structures are used to eliminate the adverse effects of impact force on the underwater load-bearing head in an environment of large tensile force and high water pressure.

[0021] There are four groups of the oil cylinder mounting holes 6, and the four groups of the oil cylinder mounting holes 6 are arranged at equal angles around the center of the load-bearing base 1. The double buffer cylinder includes an oil cylinder 7 and a piston rod 8. The oil cylinder 7 is threadedly installed inside the oil cylinder mounting hole 6. The piston rod 8 is movably inserted inside the oil cylinder 7. One end of the oil cylinder 7 is provided with an oil cylinder cover 10. One end of the piston rod 8 passes through the oil cylinder cover 10 and is threadedly connected to the load-bearing housing 2. A heavy-duty spring 9 is connected between one end inside the piston rod 8 and the oil cylinder 7, and the inside of the oil cylinder 7 is filled with hydraulic oil 11. There is a throttle passage 12 between the piston rod 8 and the inner side wall of the oil cylinder 7. When in use, when a large impact force is applied, the load-bearing housing 2 will drive the piston rod 8 to move inside the oil cylinder 7, which can effectively reduce the intensity of the impact force. And because the oil cylinder 7 is a closed space and there is a small gap (throttle passage 12) between the piston rod 8 and the oil cylinder 7, the downward pressure of the piston rod 8 causes the hydraulic oil 11 to pass through the throttle passage 12, so a large flow resistance is generated. The flow resistance and the elastic force of the heavy-duty spring 9 together resist the impact force. When the impact force disappears, the elastic force of the heavy-duty spring 9 can restore the piston rod 8 to the normal working position, realizing the impact-resistant index requirements and being able to withstand repeated impact design.

[0022] A first O-ring 13 is provided at the edge of one end of the oil cylinder 7. The oil cylinder cover 10 and the oil cylinder 7 are sealed by the first O-ring 13. A second O-ring 14 is provided inside the oil cylinder cover 10. The oil cylinder cover 10 and the piston rod 8 are sealed by the second O-ring 14. At one end of the outer side of the load-bearing housing 2, a third O-ring 15 is provided, and at least two groups of the third O-rings 15 are provided. The load-bearing housing 2 and the load-bearing base 1 are sealed by the third O-ring 15. The vulcanization and O-ring sealing structures are adopted on multiple components to achieve the sealing between the submarine cable and metal parts and the sealing between metal parts, realizing the overall sealing function of the underwater load-bearing head.

[0023] A cavity is provided inside the load-bearing housing 2, and the cavity is filled with epoxy resin 16. The aramid in the cable 5 extends into the cavity and is bonded and sealed by the epoxy resin 16. Inside this cavity, the aramid in the cable 5 and the epoxy resin 16 are mixed to form a fixing material, improving stability and sealing performance.

[0024] A sealing end cap 17 is threadedly installed at one end of the load-bearing housing 2. The cable core 4 passes through the center of the sealing end cap 17. A vulcanized body 18 is provided at one end of the sealing end cap 17. The cable core 4 passes through the center of the vulcanized body 18. The vulcanized body 18 seals the sealing end cap 17 and the cable core 4 through vulcanization. At one end of the outer side of the load-bearing housing 2, a fourth O-ring 19 is provided. The sealing end cap 17 and the load-bearing housing 2 are sealed by the fourth O-ring 19. The fourth O-ring 19 is installed on the load-bearing housing 2 to achieve the sealing between the load-bearing housing 2 and the sealing end cap 17. The material of the sealing end cap 17 is TC4 and it is fixed to the load-bearing housing 2 by threads. The vulcanized body 18 seals between the sealing end cap 17 and the cable core 4 through vulcanization.

[0025] The load-bearing base 1 is made of TC4, the oil cylinder 7 is made of TC4, the piston rod 8 is made of TC4, and the load-bearing housing 2 is made of TC4.

[0026] Embodiment 2 According to Figure 1 、 2 As shown, this embodiment proposes an impact-resistant underwater load-bearing head, including a load-bearing base 1 and a load-bearing housing 2. One end of the load-bearing housing 2 is movably installed with the load-bearing base 1. The center inside the load-bearing base 1 is used for the cable 3 to pass through, and one end of the cable 3 extends into the load-bearing housing 2. The cable core 4 inside the cable 3 passes through the load-bearing housing 2 and is sealed. One end of the cable 3 is peeled into the aramid in the cable 5, and the aramid in the cable 5 extends into the load-bearing housing 2 and is epoxy potted; Several groups of oil cylinder mounting holes 6 are provided at the edge inside the load-bearing base 1, and a double buffer cylinder part is provided inside the oil cylinder mounting hole 6. The output end of the double buffer cylinder part is connected to the load-bearing housing 2. On the premise of having large tensile force and high water pressure, an impact resistance design is realized, with the characteristics of strong impact resistance, large load-bearing tensile force (working tensile force 50 kN, breaking force ≥ 200 kN), and deep working water pressure (≥ 10 Mpa). Compared with existing products, double buffer cylinder parts and related connection structures are adopted to eliminate the adverse impact of impact force on the underwater load-bearing head in an environment of large tensile force and high water pressure.

[0027] The characteristic of the impact force is that the action time is short, but the value of the acting force is usually much higher than the working tensile force. Therefore, the impact force can be converted into an impact force with a relatively long action time and a relatively small acting force value by increasing the buffer.

[0028] There are 4 oil cylinder mounting holes 6 distributed in a circle inside the load-bearing base 1. A double buffer cylinder part is installed in each mounting hole. Each oil cylinder 7 can bear a working tensile force of 15 kN, and the compression amount of the heavy-duty spring 9 in the oil cylinder 7 is 20% - 30%. This can improve the performance and service life of the spring. The maximum telescopic stroke of the piston rod 8 can meet the impact resistance requirements. Under the action of the working tensile force of the impact-resistant underwater load-bearing head, the heavy-duty springs 9 in the four double buffer cylinder parts provide acting forces. When a large impact force is borne, the load-bearing housing 2 will drive the piston rod 8 to move inside the oil cylinder 7, which can effectively reduce the intensity of the impact force. And because the oil cylinder 7 is a closed space, there is a small gap (throttle passage 12) between the piston rod 8 and the oil cylinder 7. When the piston rod 8 presses down, the hydraulic oil 11 passes through the throttle passage 12, so a large flow resistance is generated. The flow resistance and the elastic force of the heavy-duty spring 9 together resist the impact force. When the impact force disappears, the elastic force of the heavy-duty spring 9 can restore the piston rod 8 to the normal working position, achieving the impact resistance index requirements.

[0029] The load-bearing housing 2 and the load-bearing base 1 adopt a suitable shaft and hole tolerance zone fit, so that the axis of the load-bearing housing 2 remains stable during the movement process, ensuring the stable operation of the piston rod 8. Since the use environment is underwater, a sealing structure is added to multiple parts to achieve the sealing between the submarine cable and metal parts and the sealing between metal parts and metal parts.

[0030] The impact-resistant underwater load-bearing head connects double buffer cylinder parts between the inside of the load-bearing base 1 and the load-bearing housing 2. When a large impact force is applied, the load-bearing housing 2 will drive the piston rod 8 to move into the oil cylinder 7, which can effectively reduce the intensity of the impact force. And because the oil cylinder 7 is a closed space, there is a small gap (throttle passage 12) between the piston rod 8 and the oil cylinder 7. When the piston rod 8 presses down, the hydraulic oil 11 passes through the throttle passage 12, so a large flow resistance is generated. The flow resistance and the elastic force of the heavy-duty spring 9 together resist the impact force. When the impact force disappears, the elastic force of the heavy-duty spring 9 can restore the piston rod 8 to the normal working position, achieving the requirements of the impact-resistant index, enabling the design of withstanding repeated impacts, solving the problem of poor impact resistance of the underwater load-bearing head, improving the impact resistance of the load-bearing head in case of accidents, and enhancing the reliability of the underwater load-bearing head in complex environments. On the premise of having large tensile force and high water pressure, the present invention realizes the impact-resistant design, and has the characteristics of strong impact resistance, large load-bearing tensile force (working tensile force 50kN, breaking force ≥200kN), and deep working water pressure (≥10Mpa). Compared with existing products, by adopting double buffer cylinder parts and related connection structures, the adverse effects of the impact force on the underwater load-bearing head in the environment of large tensile force and high water pressure are eliminated. At the same time, the present invention adopts vulcanization and O-ring sealing structures on multiple components to achieve the sealing between the submarine cable and metal parts, and between metal parts and metal parts, realizing the overall sealing function of the underwater load-bearing head. In addition, the installation between the load-bearing housing 2 and the load-bearing base 1 adopts the fit of the tolerance zone of the shaft and the hole, so that during the movement of the load-bearing housing 2, the axis remains stable and does not shift, ensuring the stable operation of the piston rod 8.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An impact-resistant underwater bearing head, comprising a bearing base (1) and a bearing shell (2), characterized in that: One end of the load-bearing shell (2) is movably mounted on the load-bearing base (1); the center of the interior of the load-bearing base (1) is used for the cable (3) to pass through, and one end of the cable (3) is placed in the load-bearing shell (2); the cable core (4) in the cable (3) passes through the load-bearing shell (2) and is sealed; one end of the cable (3) is stripped to form the aramid fiber (5) in the cable, and the aramid fiber (5) in the cable is placed in the interior of the load-bearing shell (2) and is epoxy-encapsulated; A plurality of groups of oil cylinder mounting holes (6) are provided at the inner edge of the load-bearing base (1), and a double buffer cylinder component is provided inside the oil cylinder mounting hole (6), and the output end of the double buffer cylinder component is connected to the load-bearing shell (2).

2. The impact-resistant underwater bearing head according to claim 1, characterized in that: At least four groups of the oil cylinder mounting holes (6) are provided, and the four groups of the oil cylinder mounting holes (6) are arranged at equal angles around the center of the bearing base (1).

3. The impact-resistant underwater bearing head according to claim 1, characterized in that: The double buffer cylinder comprises an oil cylinder (7) and a piston rod (8); the oil cylinder (7) is threadedly mounted inside the oil cylinder mounting hole (6); the piston rod (8) is movably inserted inside the oil cylinder (7); one end of the oil cylinder (7) is provided with an oil cylinder cover (10); one end of the piston rod (8) passes through the oil cylinder cover (10) and is threadedly connected to the load-bearing housing (2).

4. The impact-resistant underwater bearing head according to claim 3, characterized in that: A heavy-load spring (9) is connected between the piston rod (8) and one end inside the oil cylinder (7), and the inside of the oil cylinder (7) is filled with hydraulic oil (11). A throttling channel (12) is left between the piston rod (8) and the inner wall of the oil cylinder (7).

5. The impact-resistant underwater bearing head according to claim 4, characterized in that: A first O-ring (13) is provided at the edge of one end of the oil cylinder (7), and the oil cylinder cover (10) and the oil cylinder (7) are sealed by the first O-ring (13). A second O-ring (14) is provided on the inner side of the oil cylinder cover (10), and the oil cylinder cover (10) and the piston rod (8) are sealed by the second O-ring (14).

6. The impact-resistant underwater bearing head according to claim 1, characterized in that: A third O-ring (15) is provided at one end of the outer side of the load-bearing shell (2), and at least two groups of the third O-rings (15) are provided. The load-bearing shell (2) and the load-bearing base (1) are matched with a shaft and hole tolerance zone and sealed by the third O-ring (15).

7. The impact-resistant underwater bearing head according to claim 1, characterized in that: A cavity is provided inside the load-bearing shell (2), and the interior of the cavity is filled with epoxy resin (16); the aramid fiber (5) in the cable extends into the interior of the cavity and is bonded and sealed by the epoxy resin (16).

8. The impact-resistant underwater bearing head according to claim 1, characterized in that: A sealing end cap (17) is threadedly mounted on one end of the load-bearing shell (2), and the cable core (4) passes through the center of the sealing end cap (17).

9. The impact-resistant underwater bearing head according to claim 8, characterized in that: A vulcanized body (18) is provided at one end of the sealing end cap (17), the cable core (4) passes through the center of the vulcanized body (18), and the vulcanized body (18) seals the sealing end cap (17) and the cable core (4) by vulcanization.

10. The impact-resistant underwater bearing head according to claim 9, characterized in that: A fourth O-ring (19) is provided at one end of the outer side of the load-bearing shell (2), and the sealing end cover (17) and the load-bearing shell (2) are sealed via the fourth O-ring (19).

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