Underwater cutting cable test device

Abstract

The invention relates to the technical field of cutting cable tests, in particular to an underwater cutting cable test device. According to the brand-new underwater cutting cable testing device, the cutting cable plate-shaped test piece is tightly pressed at the bottom of the water containing barrel with the bottom hole in a sealed mode, after water with the needed height is added into the water containing barrel, the situation that the cutting cable plate-shaped test piece bears different water pressures can be simulated, then the cutting cable is detonated to cut the test piece, and the test piece is subjected to water pressure testing. The fragmentation condition of the plate-shaped test piece, namely the sealing cover, under different water pressure conditions can be obtained. The test device only applies water pressure to the sealing cover, is simple in structure, small in size and convenient to operate, greatly reduces the test cost and improves the test efficiency.

Description

An underwater cable cutting test device Technical Field

[0001] This invention relates to the field of cable cutting testing technology, and more particularly to an underwater cable cutting testing device. Background Technology

[0002] A typical launcher consists of a tube for loading the projectile and a sealing cap that seals the opening. During launch, a shaped charge cutting cable is installed inside the sealing cap. Just before ignition, the cable shatters the cap, cutting it into fragments to allow the projectile to be ejected smoothly. The degree to which the cable shatters the cap has varying effects on the launch process and the launcher itself; therefore, experiments are often necessary to determine the cable's cutting capability and the resulting fragments.

[0003] Chinese invention patent CN115655770B discloses a device for verifying the separation performance of a shaped charge cutting cable. This experimental device covers the surface of a test plate with the cutting cable and fixes the test plate before conducting a cutting test. This testing device is primarily designed for atmospheric launches. However, for underwater launches, due to the water pressure on the outside of the sealing cap, the interaction between the shock wave generated by the cutting cable and the external water pressure when the sealing cap is ruptured during launch results in a different degree of fragmentation compared to atmospheric launches. Therefore, it is necessary to conduct experiments on the cutting performance of the cutting cable under underwater launch conditions.

[0004] The current testing method involves hoisting and transporting the entire launch device into a sealed cavity, simulating an underwater launch environment by filling the sealed cavity with water, and conducting a cutting test on the cutting cable. However, this results in a large volume of testing equipment, a large amount of water to be filled and drained, a long testing process, and complicated operation, which greatly increases manufacturing, manpower, and transportation costs. Summary of the Invention

[0005] The purpose of this invention is to provide an underwater cable-cutting test device to solve the problems of existing cable-cutting test devices that simulate underwater launch environments being bulky, cumbersome to operate, and time-consuming.

[0006] The underwater cable cutting test device of the present invention adopts the following technical solution: The underwater cable cutting test device of the present invention includes a water-filled cylinder. A pressing structure for pressing a cable cutting plate-shaped specimen from bottom to top onto the lower side of the cylinder is connected to the bottom of the cylinder. A bottom hole is provided on the bottom of the cylinder at the position corresponding to the cable cutting plate-shaped specimen, so that the water in the water-filled cylinder can directly press the cable cutting plate-shaped specimen. A sealing structure is provided around the bottom hole on the lower side of the cylinder for sealing and cooperating with the upper side of the cable cutting plate-shaped specimen when it is pressed.

[0007] Furthermore, the clamping structure includes a clamping ring having a horizontal clamping edge that applies pressure from bottom to top to the circumference of the cutting cable plate-shaped specimen. The horizontal clamping edge has a clearance notch to avoid the cutting cable on the cutting cable plate-shaped specimen. The clamping structure also includes a threaded fastening assembly for locking the clamping ring to the bottom of the cylinder.

[0008] Furthermore, the clamping ring includes a limiting wall connected to the outer edge of the horizontal clamping edge, the limiting wall being used to surround the peripheral edge of the cut cable-like specimen, and the top of the limiting wall having a flange edge extending outward for connection with a threaded fastening assembly.

[0009] Furthermore, the horizontal pressing edge is formed by the inward turning edge at the bottom of the limiting wall.

[0010] Furthermore, the accommodating space enclosed by the limiting wall is square, and the flange edges are connected to the limiting wall corresponding to each side of the limiting wall.

[0011] Furthermore, the upper side of the horizontal pressing edge is provided with a buffer pad that is placed under the cutting cable plate-shaped specimen.

[0012] Furthermore, the diameter of the bottom hole is close to the diameter of the limiting wall, and the sealing structure is provided at the horizontal interval between the inner side of the limiting wall and the bottom hole at the bottom of the cylinder.

[0013] Furthermore, the sealing structure is a sealing ring installed in the mounting groove on the lower side of the cylinder.

[0014] Furthermore, the bottom of the cylinder has an extension extending outward to the outside of the water-containing cylinder, and a support leg is connected to the extension to raise the water-containing cylinder as a whole, so as to leave space for disassembling and assembling the cutting cable plate-shaped specimen on the lower side of the cylinder bottom.

[0015] Furthermore, symmetrical lifting rings are installed on the walls of the water-holding cylinder.

[0016] This invention provides a novel underwater cable-cutting test device. By sealing and pressing a plate-shaped cable specimen tightly against the bottom of a water-filled cylinder with a bottom hole, and adding water to the cylinder to the desired height, the device simulates the plate-shaped cable specimen being subjected to different water pressures. Then, the cable is detonated to cut the specimen, thus obtaining the fragmentation of the plate-shaped specimen (i.e., the sealed cap) under different water pressure conditions. This test device applies water pressure only to the sealed cap, has a simple structure, small size, and is easy to operate, greatly reducing testing costs and improving testing efficiency. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the underwater cable cutting test device of the present invention in use; Figure 2 is an enlarged view of the structure at point A in Figure 1; Figure 3 is a bottom view of Figure 1.

[0018] In the diagram: 1. Water-filled cylinder; 2. Lifting ring; 3. Bottom of cylinder; 4. Support leg; 5. Bottom hole; 6. Cutting cable plate-shaped specimen; 7. Sealing ring; 8. Buffer gasket; 9. Horizontal pressure edge; 10. Flange edge; 11. Connecting bolt; 12. Washer; 13. Compression nut; 14. Clearance notch. Detailed Implementation

[0019] This invention primarily addresses underwater launch scenarios, specifically examining the fragmentation of a sealed cover with an inner cutting cable when the cable is detonated and cut, resulting in a fragmentation condition different from that of launches in the external atmospheric environment due to external water pressure. It provides an underwater cutting cable experimental device that is simpler in structure, smaller in size, and more convenient to use compared to existing technologies.

[0020] The present invention will be illustrated below by describing different embodiments of the underwater cable-cutting test device.

[0021] One embodiment of the underwater cutting cable testing device, as shown in Figures 1-3, includes a water-filled cylinder 1. The bottom 3 of the water-filled cylinder 1 has an outwardly extending section beyond the cylinder wall. A clamping structure is connected to the outwardly extending section. The clamping structure is used to press the cutting cable plate-shaped specimen, i.e., the sealing cap, against the lower side of the bottom 3 from bottom to top. A bottom hole 5, i.e., an opening penetrating the bottom 3, is provided on the bottom 3 portion of the water-filled cylinder 1 at the position corresponding to the cutting cable plate-shaped specimen. This allows the water in the water-filled cylinder 1 to directly act on the cutting cable plate-shaped specimen 6 and apply pressure to it, simulating the water pressure condition experienced by the sealing cap underwater. To prevent water leakage at the clamping mating surface between the cutting cable plate-shaped specimen and the bottom 3, a sealing structure is provided around the bottom hole 5 on the lower side of the bottom 3 for sealing mating with its upper side when the cutting cable plate-shaped specimen 6 is clamped.

[0022] Specifically, the clamping structure includes a clamping ring. Since the sealing caps used as test objects are mostly square structures, the clamping ring in this embodiment adopts a square ring that is compatible with them. However, this does not mean that the clamping ring in the technical solution of the present invention is limited to a square ring. In other embodiments, when the sealing cap is a circle or polygon or other shapes, the shape of the clamping ring also changes accordingly and is adapted to it.

[0023] The clamping ring includes a limiting wall for surrounding the periphery of the cut cable-plate-shaped specimen 6. The bottom of the limiting wall has an inwardly turned edge, which supports the lower edge of the cut cable-plate-shaped specimen 6. The top of the limiting wall has an outwardly extending flange 10 with a connecting hole. A corresponding connecting hole is also provided on the outer extension of the cylinder bottom 3. The clamping ring is connected to the cylinder bottom 3 via a threaded fastening assembly passing through the connecting holes on the outer extension and the flange 10. This inwardly turned edge presses the cut cable-plate-shaped specimen 6 against the lower side of the cylinder bottom 3, thus forming a horizontal clamping edge 9 for pressing the cut cable-plate-shaped specimen 6. The threaded fastening assembly includes an M10 connecting bolt 11, a washer 12 placed between the bolt head of the connecting bolt 11 and the upper side of the cylinder bottom 3, and a clamping nut 13.

[0024] Since some of the cutting cables covering the lower side of the plate-shaped specimen 6 extend to the edge of the specimen, in order to avoid interference between the horizontal pressing edge 9 and the cutting cable, an avoidance notch 14 is provided on the horizontal pressing edge 9, i.e., the inward turning edge, at the position corresponding to the cutting cable.

[0025] The reason for using the lower inward-turned edge of the limiting wall as the horizontal pressure edge 9 is that the width of the inward-turned edge is relatively narrow. As can be seen from Figure 2, its width is approximately equal to the diameter of the connecting bolt 11, i.e., no more than 10 mm. By constraining the position of the cutting cable plate-shaped specimen 6 through the limiting wall, it is possible to ensure that the inward-turned edge reliably supports and presses the cutting cable plate-shaped specimen 6, and to minimize the impact of the inward-turned edge on the degree of fragmentation of the cutting cable plate-shaped specimen 6 when the cutting cable is explosively cutting it. In one embodiment, the horizontal pressure edge 9 is directly attached to the lower side of the cutting cable plate-shaped specimen 6; in another embodiment, a buffer pad 8 is provided on the upper side of the horizontal pressure edge 9, which is placed under the cutting cable plate-shaped specimen 6 to avoid a large impact on the horizontal pressure edge 9 when the cutting cable explodes, which would cause the horizontal pressure edge 9 to deform and fail to provide reliable pressing for the cutting cable plate-shaped specimen 6. Moreover, the buffer pad 8 can also prevent the flatness of the pressing surface between the horizontal pressure plate and the cutting cable plate-shaped specimen 6 from being insufficient, thus preventing the uniform application of the pressing force.

[0026] In actual use, the area of ​​the sealing cap that bears water pressure is relatively large. Therefore, in order to simulate the pressure bearing condition of the sealing cap as realistically as possible, the diameter of the bottom hole 5 is close to the diameter of the limiting wall, or in other words, the diameter of the bottom hole 5 is close to the planar dimension of the cut cable plate-shaped specimen 6. Specifically, the planar dimension of the cut cable plate-shaped specimen 6 is larger than the diameter of the bottom hole 5, and the larger portion can accommodate a sealing structure to ensure a seal between the cut cable plate-shaped specimen 6 and the bottom of the cylinder 3. Therefore, a sealing structure is provided at the horizontal interval between the inner side of the limiting wall and the bottom hole 5 of the bottom of the cylinder 3. The sealing structure can be a sealing gasket sandwiched between the cut cable plate-shaped specimen 6 and the bottom of the cylinder 3. In a preferred embodiment, the sealing structure adopts a sealing ring 7 installed in the mounting groove on the lower side of the bottom of the cylinder 3. The sealing ring 7 has a small cross-sectional dimension and requires less space.

[0027] The lifting ring 2, clamping ring, and support leg 4 are all made of Q235 steel, coated with anti-rust primer and topcoat. The water-holding cylinder 1 and cylinder bottom 3 are both made of 316L stainless steel and are sealed and welded into a single structure. The sealing ring 7 and buffer gasket 8 are made of neoprene rubber.

[0028] To facilitate the transfer of the entire device, in addition to the above embodiment, lifting rings 2 are added to the wall of the water-filled cylinder 1. The lifting rings 2 are symmetrically installed for lifting.

[0029] Since the cutting cable plate-shaped specimen 6 is installed at the bottom 3 of the water-filled cylinder 1, in order to facilitate the assembly and disassembly of the cutting cable plate-shaped specimen 6, a support leg 4 is connected to the outer extension to raise the water-filled cylinder 1 as a whole, so as to leave space for the assembly and disassembly of the cutting cable plate-shaped specimen 6 on the lower side of the bottom 3.

[0030] As described above, the sealing cap is mostly square, therefore the bottom 3 of the water-holding cylinder 1 can be square, while the water-holding cylinder 1 can be circular. The single-side dimension of the bottom 3 is larger than the outer diameter of the water-holding cylinder 1, forming an extension outside the water-holding cylinder 1. The support legs 4 are connected at the four corners of the bottom 3. The support legs 4 can be solid rods or hollow steel pipes. When hollow steel pipes are used, a horizontal steel plate is installed at the bottom of the support legs 4 as a foot to improve the load-bearing conditions.

[0031] The present invention is not limited to the embodiments described above. In other embodiments, the clamping ring can be a horizontal ring plate with a convex ring on the upper side. The convex ring is used to limit the cutting cable plate-shaped specimen 6. The plate part outside the convex ring is fixedly connected to the bottom of the cylinder 3 by a threaded fastening assembly.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. An underwater cable-cutting test device, characterized in that, The device includes a water-filled cylinder with a pressing structure at its bottom for pressing a cutting cable-like specimen against the lower side of the cylinder from bottom to top. A bottom hole is provided on the bottom of the cylinder at the position corresponding to the cutting cable-like specimen, so that the water in the water-filled cylinder can directly press the cutting cable-like specimen. A sealing structure is provided around the bottom hole on the lower side of the cylinder for sealing with the upper side when the cutting cable-like specimen is pressed.

2. The underwater cable-cutting test device according to claim 1, characterized in that, The clamping structure includes a clamping ring with a horizontal clamping edge that applies pressure from bottom to top to the circumference of the cutting cable plate-shaped specimen. The horizontal clamping edge has a clearance notch to avoid the cutting cable on the cutting cable plate-shaped specimen. The clamping structure also includes a threaded fastening assembly for locking the clamping ring to the bottom of the cylinder.

3. The underwater cable-cutting test device according to claim 2, characterized in that, The clamping ring includes a limiting wall connected to the outer edge of the horizontal clamping edge, the limiting wall being used to surround the peripheral edge of the cut cable plate-shaped specimen, and the top of the limiting wall having a flange edge extending outward for connection with a threaded fastening assembly.

4. The underwater cable-cutting test device according to claim 3, characterized in that, The horizontal pressing edge is formed by the inward turning edge at the bottom of the limiting wall.

5. The underwater cable-cutting test device according to claim 3, characterized in that, The accommodating space enclosed by the limiting wall is square, and the flange edges are connected to the limiting wall on each side corresponding to the limiting wall.

6. The underwater cable-cutting test device according to claim 3, characterized in that, The upper side of the horizontal pressing edge is provided with a buffer pad that is placed under the cutting cable plate-shaped specimen.

7. The underwater cable-cutting test device according to claim 3, characterized in that, The diameter of the bottom hole is close to the diameter of the limiting wall, and the sealing structure is set at the horizontal interval between the inner side of the limiting wall and the bottom hole at the bottom of the cylinder.

8. The underwater cable-cutting test apparatus according to claim 7, characterized in that, The sealing structure is a sealing ring installed in the mounting groove on the lower side of the cylinder.

9. The underwater cable-cutting test apparatus according to any one of claims 1-8, characterized in that, The bottom of the cylinder has an extension section that extends outward toward the water-containing cylinder body. A support leg is connected to the extension section to raise the water-containing cylinder body as a whole, so as to leave space for disassembling and assembling the cutting cable plate-shaped specimen on the lower side of the cylinder bottom.

10. The underwater cable-cutting test apparatus according to any one of claims 1-8, characterized in that, The water-holding cylinder has symmetrically installed lifting rings on its walls.

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