A conveying and adjusting mechanism used in submarine cable processing and testing equipment
By integrating detection equipment with transmission equipment, real-time detection and environmental simulation of submarine cables during transmission can be achieved, solving the problem of low detection efficiency in existing technologies and improving the compactness and detection accuracy of detection equipment.
Patent Information
- Application Number
- CN202511005980.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-22
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2045-07-22
AI Technical Summary
Existing submarine cable detection equipment cannot be integrated with transmission equipment, resulting in low detection efficiency, time-consuming and labor-intensive.
A conveying and adjustment mechanism for submarine cable processing and testing equipment was designed. It integrates a detection box, a guide wheel assembly, an electrically controlled flip fairlead arm, an electrically controlled fairlead wheel assembly, an electrically controlled lifting conveying device, and an electrically controlled surround optical detection unit. It enables real-time detection of submarine cables during transportation and simulation of pressure and biological damage in different seabed environments.
It improves the compactness and functional integration of the detection equipment, can realistically simulate different depths and lateral pressures, improves the accuracy and diversity of detection values, and enhances the efficiency and precision of submarine cable detection.
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Figure CN120504215B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of auxiliary conveying for submarine cable processing and testing, and in particular to a conveying and regulating mechanism applied to submarine cable processing and testing equipment. Background Art
[0002] Submarine cables are used to transmit signals and electrical energy in critical applications such as long-distance islands and cross-sea infrastructure. They are primarily wrapped in insulating materials and laid on the seabed. To ensure that submarine cables can withstand the high-pressure and highly corrosive environment of the seabed for a long time, their surface compressive and corrosion resistance must be tested during production. Current testing methods rely solely on static localized pressurization and placing test samples in aging chambers. This method is inherently limited, time-consuming, and labor-intensive. It cannot be directly integrated with transmission equipment to test submarine cables in transit, resulting in inefficient processing and testing. Summary of the Invention
[0003] The technical problem to be solved by the present invention is that the equipment currently used for submarine cable detection cannot be combined with the transportation equipment, resulting in time-consuming and labor-intensive transportation and low efficiency of detection.
[0004] The technical solution adopted by the present invention to solve its technical problems is: a conveying and adjusting mechanism applied to submarine cable processing and testing equipment, comprising a test box for storing seawater simulation liquid, side guide wheel groups are installed on both sides of the upper end of the test box, a top crossbeam is fixedly assembled at the opening position of the upper end of the test box, electric-controlled flip fairlead arms are installed on both sides of the inner top surface of the top crossbeam, an electric-controlled fairlead wheel group is installed at the bottom end of the electric-controlled flip fairlead arm, a longitudinal mounting guide rail is installed on the inner top surface of the top crossbeam, an electric-controlled lifting conveying device is installed inside the longitudinal mounting guide rail, and the outer ends of the side guide wheel groups are installed with electric-controlled surround optical detection units.
[0005] The upper ends of the detection box are symmetrically provided with upper guide notches for installing side guide wheel groups. The side guide wheel groups include a transverse mounting frame fixedly installed in the upper guide notches and side-mounted guide wheels installed on both sides of the transverse mounting frame.
[0006] The electrically controlled flip fairlead arm comprises flip adjustment arms movably mounted on both sides of the inner top surface of the top beam, a bottom assembly frame fixedly mounted on the bottom flip end of the flip adjustment arm, and a control support rod movably mounted on the inner top surface of the top beam.
[0007] The electrically controlled cable guide wheel assembly includes an embedded guide rail installed on the inner walls of both sides of the bottom assembly frame, an embedded electrically controlled screw rod movably installed inside the embedded guide rail, an internal thread adjustment block threadedly sleeved on the embedded electrically controlled screw rod, and an extrusion guide wheel movably installed on the internal thread adjustment block.
[0008] The electrically controlled lifting conveying device includes a main lifting screw movably installed inside the longitudinal mounting guide rail, a horizontal lifting frame threadedly connected to the main lifting screw through internal thread adjustment blocks on both sides, a horizontal electrically controlled conveyor belt installed inside the horizontal lifting frame, and an embedded telescopic clamping block installed on the inner wall of the horizontal electrically controlled conveyor belt.
[0009] The horizontal electric-controlled conveyor belt includes a main driving wheel movably installed inside the horizontal lifting frame, an auxiliary driven wheel, a flexible conveyor belt, a horizontal assembly bar fixedly installed on the flexible conveyor belt, and an external fairlead seat installed on the horizontal assembly bar.
[0010] A lateral telescopic groove for installing an embedded telescopic clamping block is provided on the inner curved surface of the external cable guide seat. The embedded telescopic clamping block includes an electromagnet fixedly installed on the inner wall of the lateral telescopic groove, a clamping block slidably installed at the opening position of the lateral telescopic groove, and an iron spring installed between the electromagnet and the clamping block.
[0011] The electrically controlled surround optical detection unit includes an annular guide rail fixed inside a horizontal mounting frame, an internal drive ring movably mounted inside the annular guide rail, a lateral mounting seat fixedly mounted on the side wall of the internal drive ring, and an optical ranging module mounted on the lateral mounting seat.
[0012] An inner mounting ring is installed on the inner side wall of the transverse mounting frame, and a high-pressure nozzle for quickly removing water on the surface of the submarine cable is installed on the outer side surface of the inner mounting ring.
[0013] A transverse top guide rail is fixedly welded on the inner top surface of the top crossbeam at the connecting end of the longitudinal mounting guide rail. The longitudinal mounting guide rail is an inverted T-shaped structure. The longitudinal mounting guide rail is slidably inserted into the interior of the transverse top guide rail through the top transverse section and fixed to the interior of the transverse top guide rail by bolts.
[0014] The beneficial effects of the present invention are:
[0015] (1) The conveying and adjusting mechanism of the present invention applied to submarine cable processing and testing equipment greatly improves the compactness and functional integration of the equipment by directly integrating the testing equipment into the conveying equipment;
[0016] (2) An electrically controlled lifting and conveying device is installed inside the longitudinal mounting rail on the inner top surface of the top crossbeam, which can control the squeezing of the submarine cable, thereby simulating the seabed pressure at different depths and improving the simulation authenticity;
[0017] (3) By arranging embedded telescopic clamps on the inner wall of the horizontal electric-controlled conveyor belt of the electric-controlled lifting conveyor device, not only can the linkage conveying efficiency of the horizontal electric-controlled conveyor belt be improved, but also the squeezing force on the lateral surface of the submarine cable can be simulated, and the pressure under different sea environments can be realistically simulated;
[0018] (4) By cooperating with the horizontal electric-controlled conveyor belt and the embedded telescopic clamp, it is possible to simulate not only the seawater pressure at different depths but also the damage of marine organisms to the submarine cable, making the types of simulated detection more diverse;
[0019] (5) An electrically controlled surround optical detection unit is installed at the outer end of the side guide wheel group. It can not only detect the surface of the incoming submarine cable, but also compare it with the surface of the outgoing submarine cable to judge the surface size change of the submarine cable, greatly improving the accuracy of the detection value. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The present invention will be further described below with reference to the accompanying drawings and examples.
[0021] Figure 1 It is a structural schematic diagram of the present invention.
[0022] Figure 2 It is a schematic diagram of the internal structure of the present invention.
[0023] Figure 3 It is a structural schematic diagram of the electrically controlled lifting conveying device in the present invention.
[0024] Figure 4 It is a schematic diagram of the internal structure of the external fairlead in the present invention.
[0025] Figure 5 It is a schematic diagram of the internal structure of the side-mounted guide wheel group in the present invention.
[0026] In the figure, 1. Inspection box, 2. Side guide wheel assembly, 3. Top crossbeam, 4. Electric-controlled flip fairlead arm, 5. Electric-controlled fairlead wheel assembly, 6. Longitudinal mounting rail, 7. Electric-controlled lifting conveyor, 8. Electric-controlled surround optical inspection unit, 21. Horizontal mounting frame, 22. Side-mounted guide wheel, 41. Flip adjustment arm, 42. Bottom assembly frame, 43. Control support rod, 51. Embedded guide rail, 52. Embedded electric control screw, 53. Internal thread adjustment block , 54. Extrusion guide wheel, 70. Iron spring, 71. Main lifting screw, 72. Horizontal lifting frame, 73. Main drive wheel, 74. Auxiliary driven wheel, 75. Flexible conveyor belt, 76. Horizontal assembly strip, 77. External cable guide seat, 78. Electromagnet, 79. Clamp, 81. Annular guide rail, 82. Internal drive ring, 83. Lateral mounting seat, 84. Optical ranging module, 9. Inner mounting ring, 10. High-pressure nozzle, 11. Horizontal top guide rail. DETAILED DESCRIPTION
[0027] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.
[0028] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.
[0029] Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The shown embodiment is a conveying and adjusting mechanism for submarine cable processing and testing equipment, comprising a test box 1 for storing seawater simulation liquid, with side guide wheel groups 2 installed on both sides of the upper end of the test box 1, a top crossbeam 3 fixedly mounted at the opening position of the upper end of the test box 1, electrically controlled flip fairlead arms 4 installed on both sides of the inner top surface of the top crossbeam 3, an electrically controlled fairlead wheel group 5 installed on the bottom end of the electrically controlled flip fairlead arm 4, a longitudinal mounting guide rail 6 installed on the inner top surface of the top crossbeam 3, an electrically controlled lifting and conveying device 7 installed inside the longitudinal mounting guide rail 6, and electrically controlled surround optical detection units 8 installed on the outer ends of the side guide wheel groups 2.
[0030] Working principle: Fill the inside of the test box 1 with simulated seawater, and then adjust the concentration of the internal simulated liquid by adding elements such as fresh water and sea salt as needed to simulate seawater in different environments. The submarine cable is then introduced into the test box 1 through the side guide wheel group 2 on the left, and then the electrically controlled flip fairlead arms 4 on both sides flip the electrically controlled fairlead wheel group 5 inward to squeeze the submarine cable, and the electrically controlled lifting and conveying device 7 simulates water pressure by squeezing downward, and then simulates lateral water pressure by squeezing on both sides. At the same time, an electrically controlled surround optical detection unit 8 is set at the import and export ends to perform optical scanning and comparison on the surface of the submarine cable to determine whether the detection result is qualified.
[0031] In order to cooperate with the side guidance, upper guide notches for installing the side guide wheel group 2 are symmetrically opened on both sides of the upper end of the detection box 1. The side guide wheel group 2 includes a transverse mounting frame 21 fixedly installed on the upper guide notch and side-mounted guide wheels 22 installed on both sides of the inside of the transverse mounting frame 21.
[0032] The submarine cable is introduced into the interior of the inspection box 1 from the side-mounted guide wheel 22 at the inlet end of the inspection box 1, and then introduced to the bottom of the electric-controlled lifting conveying device 7 through the electric-controlled fairlead wheel group 5 at the bottom end of the electric-controlled flip fairlead arm 4 on the left, and then introduced from the electric-controlled fairlead wheel group 5 at the bottom end of the electric-controlled flip fairlead arm 4 on the right to the side-mounted guide wheel 22 at the outlet end and exported to the outside of the inspection box 1.
[0033] In order to cooperate with the electrically controlled flip adjustment, the electrically controlled flip fairlead arm 4 includes a flip adjustment arm 41 movably mounted on both sides of the inner top surface of the top beam 3, a bottom assembly frame 42 fixedly mounted on the bottom flip end of the flip adjustment arm 41, and a control support rod 43 movably mounted on the inner top surface of the top beam 3.
[0034] By controlling the extension and retraction of the strut 43, the flip adjustment arm 41 is controlled to flip, thereby driving the bottom assembly frame 42 to move, thereby controlling the electrically controlled cable guide wheel assembly 5 inside it to squeeze and tighten the submarine cables on both sides, and cooperating with the electrically controlled lifting and conveying device 7 to increase the downward pressure of the submarine cable.
[0035] In order to cooperate with the electric control adjustment so that it can adapt to more flipping and guiding angles, the electric control cable guide wheel assembly 5 includes an embedded guide rail 51 installed on the inner walls on both sides of the bottom assembly frame 42, an embedded electric control screw rod 52 movably installed inside the embedded guide rail 51, an internal thread adjustment block 53 threadedly sleeved on the embedded electric control screw rod 52 and an extrusion guide wheel 54 movably installed on the internal thread adjustment block 53.
[0036] The embedded electric control screw 52 rotates to drive the internal thread adjustment blocks 53 on both sides of the extrusion guide wheel 54 to adjust and translate along the embedded guide rail 51.
[0037] The relative positions of the extrusion guide wheels 54 on both sides of the bottom assembly frame 42 are thereby adjusted to adapt the flipping angle of the bottom assembly frame 42 .
[0038] In order to cooperate with the lifting and lowering adjustment, the electrically controlled lifting conveying device 7 includes a main lifting screw 71 movably installed inside the longitudinal mounting guide rail 6, a horizontal lifting frame 72 threadedly connected to the main lifting screw 71 through internal threaded adjustment blocks on both sides, a horizontal electrically controlled conveyor belt installed inside the horizontal lifting frame 72, and an embedded telescopic clamp installed on the inner wall of the horizontal electrically controlled conveyor belt.
[0039] The main lifting screw 71 rotates to control the horizontal lifting frame 72 to move up and down along the vertical mounting guide rail 6, thereby adjusting the downward force.
[0040] In order to cooperate with the drive, the horizontal electric-controlled conveyor belt includes a main driving wheel 73 movably installed inside the horizontal lifting frame 72, an auxiliary driven wheel 74, a flexible conveyor belt 75, a horizontal assembly bar 76 fixedly installed on the flexible conveyor belt 75, and an external fairing seat 77 installed on the horizontal assembly bar 76.
[0041] A transverse assembly groove that matches the transverse assembly strip 76 is provided on the assembly surface of the external fairlead seat 77. The external fairlead seat 77 is sleeved on the outer side of the transverse assembly strip 76 through the transverse assembly groove, and then the locking bolt on the external fairlead seat 77 is screwed into the limiting through hole inside the transverse assembly strip 76 for limiting and fixing.
[0042] In order to cooperate with lateral adjustment and extrusion control, a lateral telescopic groove for installing an embedded telescopic clamp is opened on the inner curved surface of the external cable guide seat 77. The embedded telescopic clamp includes an electromagnet 78 fixedly installed on the inner wall of the lateral telescopic groove, a clamp 79 slidably installed at the opening position of the lateral telescopic groove, and an iron spring 70 installed between the electromagnet 78 and the clamp 79.
[0043] The internal extrusion force of the iron spring 70 can be adjusted according to different seabed pressures. The way to adjust the extrusion force of the iron spring 70 is to change the internal position of the electromagnet 78 in the lateral telescopic groove, and to set a lateral adjustment bolt on the outer side of the external cable guide seat 77. The lateral adjustment bolt is rotated and inserted into the inside of the lateral telescopic groove to control the opening extrusion of the electromagnet 78 in the lateral telescopic groove, thereby changing the lateral extrusion force of the clamp 79.
[0044] The main driving wheel 73 drives the flexible conveyor belt 75 to run along the auxiliary driven wheel 74. The horizontal assembly strip 76 installed on the surface of the flexible conveyor belt 75 will drive the external fairlead seat 77 to move, squeezing the surface of the submarine cable from the top downward, forming a downward squeezing force. Then, the submarine cable is squeezed from both sides through the embedded telescopic clamping blocks, thereby forming squeezing forces from both sides to the submarine cable, thereby ensuring the authenticity of the pressure simulation and assisting in the translational conveyance of the submarine cable.
[0045] The embedded telescopic clamp can also be controlled by intermittent opening and closing, and the main driving wheel 73 is used to drive the flexible conveyor belt 75 to run along the auxiliary driven wheel 74 to simulate the biting action of marine animals on the submarine cable.
[0046] In order to cooperate with optical detection, the electrically controlled surround optical detection unit 8 includes an annular guide rail 81 fixed inside the horizontal mounting frame 21, an internal drive ring 82 movably installed inside the annular guide rail 81, a lateral mounting seat 83 fixedly installed on the side wall of the internal drive ring 82, and an optical ranging module 84 installed on the lateral mounting seat 83.
[0047] An external drive motor for controlling the internal drive ring 82 is fixed on the outer surface of the annular guide rail 81. The external drive motor is engaged with the outer arc surface of the internal drive ring 82 through the adjusting gear on the drive shaft. The external drive motor controls the internal drive ring 82 to rotate along the annular guide rail 81, thereby controlling the rotation of the lateral mounting seat 83. The clamping bracket on the lateral mounting seat 83 is used to fix the optical ranging module 84, so as to facilitate the optical ranging module 84 to perform surround optical detection along the outer wall of the submarine cable.
[0048] By performing a surround optical inspection on the lead-in section and measuring using optical ranging, the specifications, dimensions and surface of the submarine cable are determined by the change in distance. The lead-in position is then determined based on the speed of delivery. The deformation and corrosion changes are then determined using a front-to-back comparison method to determine whether the submarine cable is qualified.
[0049] In order to assist in clearing the accumulated water on the surface of the submarine cable and thus improve the accuracy of optical recognition, an inner mounting ring 9 is installed on the inner wall of the horizontal mounting frame 21, and a high-pressure nozzle 10 for quickly removing the accumulated water on the surface of the submarine cable is installed on the outer surface of the inner mounting ring 9.
[0050] The inner mounting ring 9 is arranged at the inner end of the horizontal mounting frame 21 to perform high-pressure air drying and drainage on the surface of the introduced submarine cable, which can improve the dryness of the surface of the submarine cable when it is led out, facilitating subsequent optical detection and comparison.
[0051] In order to cooperate with the top installation and adjustment, a transverse top guide rail 11 is fixedly welded on the connection end of the longitudinal mounting guide rail 6 on the inner top surface of the top beam 3. The longitudinal mounting guide rail 6 is an inverted T-shaped structure. The longitudinal mounting guide rail 6 is slid through the top transverse section and inserted into the interior of the transverse top guide rail 11 and fixed to the interior of the transverse top guide rail 11 by bolts.
[0052] Longitudinal locking bolts are installed on both sides of the inner top surface of the longitudinal mounting guide rail 6, and a strip assembly opening that matches the longitudinal locking bolts is opened at the upper end of the transverse top guide rail 11. The longitudinal mounting guide rail 6 is fixed to the transverse top guide rail 11 by the longitudinal locking bolts passing through the strip assembly opening.
[0053] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.
Claims
1. A conveying and regulating mechanism for submarine cable processing and testing equipment, comprising a testing box (1) for storing seawater simulating liquid, characterized in that: Side guide wheel assemblies (2) are installed on both sides of the upper end of the detection box (1); a top crossbeam (3) is fixedly installed at the opening position of the upper end of the detection box (1); electrically controlled flip fairlead arms (4) are installed on both sides of the inner top surface of the top crossbeam (3); an electrically controlled fairlead wheel assembly (5) is installed at the bottom end of the electrically controlled flip fairlead arm (4); a longitudinal mounting guide rail (6) is installed on the inner top surface of the top crossbeam (3); an electrically controlled lifting conveying device (7) is installed inside the longitudinal mounting guide rail (6); and an electrically controlled surrounding optical detection unit (8) is installed on the outer ends of the side guide wheel assemblies (2); The interior of the test box (1) is filled with simulated seawater, and then the concentration of the simulated liquid inside is adjusted by adding fresh water and sea salt as needed to simulate seawater in different environments. Then the submarine cable is introduced into the test box (1) through the side guide wheel assembly (2) on the left side, and then the electric-controlled flip fairlead arms (4) on both sides flip the electric-controlled fairlead wheel assembly (5) inward to squeeze the submarine cable, and the electric-controlled lifting conveying device (7) simulates water pressure by squeezing downward, and then simulates lateral water pressure by squeezing on both sides. At the same time, an electric-controlled surrounding optical detection unit (8) is set at the import and export ends to perform optical scanning and comparison on the surface of the submarine cable to determine whether the detection result is qualified; The electrically controlled lifting conveying device (7) comprises a main lifting screw (71) movably mounted inside the longitudinal mounting guide rail (6), a transverse lifting frame (72) threadedly sleeved on the main lifting screw (71) via internal threaded adjustment blocks on both sides, a transverse electrically controlled conveying belt mounted inside the transverse lifting frame (72), and an embedded telescopic clamping block mounted on the inner wall of the transverse electrically controlled conveying belt; The transverse electric-controlled conveyor belt comprises a main driving wheel (73) movably mounted inside a transverse lifting frame (72), a secondary driven wheel (74), a flexible conveyor belt (75), a transverse assembly bar (76) fixedly mounted on the flexible conveyor belt (75), and an external fairlead (77) mounted on the transverse assembly bar (76); A lateral telescopic groove for installing an embedded telescopic clamping block is provided on the inner arc surface of the external cable guide seat (77), and the embedded telescopic clamping block comprises an electromagnet (78) fixedly installed on the inner wall of the lateral telescopic groove, a clamping block (79) slidably installed at the opening position of the lateral telescopic groove, and an iron spring (70) installed between the electromagnet (78) and the clamping block (79).
2. The conveying and regulating mechanism for submarine cable processing and testing equipment according to claim 1 is characterized by: The detection box (1) has upper guide notches symmetrically formed on both sides of the upper end for mounting a side guide wheel assembly (2). The side guide wheel assembly (2) comprises a transverse mounting frame (21) fixedly mounted on the upper guide notch and side-mounted guide wheels (22) mounted on both sides of the interior of the transverse mounting frame (21).
3. The conveying and regulating mechanism for submarine cable processing and testing equipment according to claim 1 is characterized by: The electrically controlled flip fairlead arm (4) comprises a flip adjustment arm (41) movably mounted on both sides of the inner top surface of the top crossbeam (3), a bottom assembly frame (42) fixedly mounted on the bottom flip end of the flip adjustment arm (41), and a control support rod (43) movably mounted on the inner top surface of the top crossbeam (3).
4. The conveying and regulating mechanism for submarine cable processing and testing equipment according to claim 2 is characterized by: The electrically controlled cable guide wheel assembly (5) comprises an embedded guide rail (51) mounted on the inner walls of both sides of the bottom assembly frame (42), an embedded electrically controlled screw rod (52) movably mounted inside the embedded guide rail (51), an internal thread adjustment block (53) threadedly sleeved on the embedded electrically controlled screw rod (52), and an extrusion guide wheel (54) movably mounted on the internal thread adjustment block (53).
5. The conveying and regulating mechanism for submarine cable processing and testing equipment according to claim 2 is characterized by: The electrically controlled surround optical detection unit (8) comprises an annular guide rail (81) fixed inside a transverse mounting frame (21), an internal drive ring (82) movably mounted inside the annular guide rail (81), a lateral mounting seat (83) fixedly mounted on a side wall of the internal drive ring (82), and an optical distance measurement module (84) mounted on the lateral mounting seat (83).
6. The conveying and regulating mechanism for submarine cable processing and testing equipment according to claim 2 is characterized by: An inner mounting ring (9) is installed on the inner side wall of the transverse mounting frame (21), and a high-pressure nozzle (10) for quickly removing surface water on the submarine cable is installed on the outer side surface of the inner mounting ring (9).
7. The conveying and regulating mechanism for submarine cable processing and testing equipment according to claim 1 is characterized by: A transverse top guide rail (11) is fixedly welded on the inner top surface of the top crossbeam (3) at the connection end of the longitudinal mounting guide rail (6). The longitudinal mounting guide rail (6) is an inverted T-shaped structure. The longitudinal mounting guide rail (6) is slidably inserted into the interior of the transverse top guide rail (11) through the top transverse section and is fixedly assembled with the interior of the transverse top guide rail (11) by bolts.
Citation Information
Patent Citations
Submarine cable high-pressure-resistant cabin-penetrating test device and test method
CN115791416A
Device and method for testing marine environment resistance of submarine cable material
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