97 results about "Umbilical cable" patented technology

The invention discloses an umbilical cable for a lunar penetrator and a coiling installation method of the umbilical cable, and relates to the technical field of lunar penetrators. The umbilical cable main body comprises an armor tube, an umbilical cable insulating sheath and an umbilical cable metal shielding layer, a Kevlar rope and a cable are arranged in the umbilical cable metal shielding layer, and the length of the Kevlar rope is smaller than that of the cable. When the umbilical cable main body is mounted in a coiled manner, the umbilical cable main body extending out of the penetration stage forms an inverted S-shaped back-bending section outside the joint of the penetration stage and the power stage; and meanwhile, the umbilical cable main body is also subjected to wave-shaped wire coiling on the outer wall of the power stage, and is mounted on the power stage through a fixing assembly. The invention provides an umbilical cable for a lunar penetrator and a coiling installation method of the umbilical cable, which can ensure that the umbilical cable is not damaged in a penetration process so as to carry out effective data transmission.

The invention discloses a dynamic encryption transmission method and system for sound-light alarm signals, and relates to the field of data encryption, and the method comprises the steps: obtaining a dynamic environment entropy value; generating a pseudo-random chaotic sequence; obtaining a helium-oxygen mixed gas density parameter in the dynamic environment entropy value; segmenting a preset standard alarm waveform into a plurality of signal waveforms in a time domain, and generating a distorted signal waveform according to the helium-oxygen mixed gas density parameter; performing encryption modulation on the distorted signal waveform to generate an encrypted distorted signal waveform; determining a sending sequence and a sending interval of the encrypted distortion signal waveform by combining a pseudo-random chaos sequence based on an impedance fluctuation value and background acoustic spectrum characteristics in the dynamic environment entropy; generating a dynamic modulation signal based on the transmission sequence and the transmission interval; the dynamic modulation signal is sent to a water surface console through an umbilical cable; and receiving the guide pulse, performing phase conjugation processing on the guide pulse, generating an echo verification signal, and transmitting the echo verification signal back to the water surface console.

The invention discloses a cooperative control simulation system for an underwater robot and an umbilical cable system, belongs to the technical field of ocean engineering simulation and automatic control, and is used for analyzing system dynamic characteristics in the research and development stage of deep sea operation equipment. Comprising an environment initialization and marine environment construction module, a mother ship model construction module, an underwater robot and umbilical cable coupling module, an instruction generation module, a man-machine interaction control module and a data acquisition and storage module. According to the method, an external interference source with physical authenticity is provided for a control algorithm by combining an energy density function and simulating a composite environment modeling method of a sea level height field and an LOD dynamic grid, and a distributed model prediction control algorithm for uniformly optimizing underwater robot trajectory tracking and umbilical cable tension safety maintenance is constructed; data such as the motion state of the underwater robot and the tension of the umbilical cable can be output in real time, algorithm performance testing is completed in a virtual environment, and dependence on high-cost sea testing is not needed.

The invention discloses a seabed shallow casing section thermal insulation structure for polar region supercritical carbon dioxide drilling, which comprises a casing, a thermal insulation coating, a protective coating, an annular cement slurry layer, an electric heating pipe, a sensor module, a wireless conductive module, a ground system and a seabed wireless transmission module, and is characterized in that the electric heating pipe is fixed on the outer wall of the casing through a hoop; the outer wall of the casing pipe is sequentially coated with a heat preservation coating, a protective coating and an annular cement paste layer from inside to outside, the wireless conductive module is integrated at the end of the casing pipe, and the ground system comprises a ground data acquisition system and a ground control center. The sea surface platform is provided with a ground data acquisition system and a ground control center which are connected with the seabed wireless transmission module through an umbilical cable, and temperature and pressure data acquired by the sensor module are uploaded to the ground control center. According to the invention, the problems of rapid heat loss, annular air channeling, casing mechanical property degradation, poor drilling fluid fluidity and the like of the seabed shallow casing section in the polar region extreme low-temperature environment are solved.

The invention provides a time-space structured sparse optical coding deepwater heterogeneous network data synchronization method and system, and the method comprises the steps: carrying out the sparse decomposition of the time sequence clock deviation data of each current underwater node at a transmitting end device of a deepwater heterogeneous network based on a trained over-complete dictionary, and obtaining an original sparse vector; converting the dynamic compression observation data corresponding to the original sparse vector into an optical signal, and transmitting the optical signal to a receiving end device of the deepwater heterogeneous network by a transmitting end device through an umbilical cable; demodulating the optical signal into an observation vector through receiving end equipment, inputting the observation vector into the trained deep expansion network model, and outputting a reconstructed sparse vector by the deep expansion network model; and recovering the reconstructed sparse vector into a clock skew signal through the over-complete dictionary, and generating a clock synchronization calibration instruction to realize data synchronization of the corresponding underwater node. According to the invention, the problems of high bandwidth occupation, low signal ratio and poor reconstruction time efficiency existing in the underwater network time synchronization technology can be solved.

The application discloses a seabed garbage cleaning device, which comprises a garbage grabbing robot, an auxiliary storage and transportation robot, a garbage storage and transportation auxiliary ship, a signal cable and an umbilical cable; the auxiliary storage and transportation robot is connected with the garbage grabbing robot through the umbilical cable, forms a negative pressure, sucks the grabbed garbage from the garbage grabbing robot into the auxiliary storage and transportation robot, and then transfers the garbage into the garbage storage and transportation auxiliary ship; the garbage grabbing robot is connected with the garbage storage and transportation auxiliary ship through the signal cable; the garbage grabbing robot comprises an upper cavity, a lower cavity, a cavity mechanical claw and a robot propulsion system; the upper cavity and the lower cavity enclose a negative pressure cavity; the lower cavity is provided with the cavity mechanical claw and the robot propulsion system. The application further discloses a seabed garbage cleaning system which comprises the seabed garbage cleaning device and a controller. The application further discloses a seabed garbage cleaning method. The application can collect garbage in a way that can avoid stirring seabed silt as much as possible and reduce the influence of the collecting process on seabed organisms.

The invention discloses a one-time laying system for a wave glider and a collaborative operation method of the one-time laying system, and belongs to the technical field of ocean engineering. The system comprises a wave glider and a transferring and laying device. The moving, transporting and laying device is a detachable separation support, and an upper laying support and a lower moving support are connected through a positioning pin. The laying support is provided with a bearing face matched with the ship body, four hanging rings, a supporting rod for supporting the traction machine and a floating body arranged on the middle rear portion. The method comprises the steps that the device is moved to a deck to be locked; the positioning pins are taken down, and the whole support and the glider are vertically hoisted and laid through the four slings; when the glider is immersed in water, the bracket inclines forward by using the floating body, and the glider is automatically separated; and the mother ship leaves and recycles the laying bracket. Rapid, stable and safe one-time laying of the wave glider under the complex sea condition is achieved, the risk of graded laying and umbilical cable winding are avoided, and the operation efficiency and safety are remarkably improved.

The invention discloses a hanging type unmanned aerial vehicle hangar and a using method thereof.The hanging type unmanned aerial vehicle hangar comprises a movable bin and a hanging arm mechanism installed on the movable bin, a retractable umbilical cable is arranged on the hanging arm mechanism, a protective door is installed at the top of the movable bin, and a holding device used for clamping and positioning an unmanned aerial vehicle is installed in the movable bin and located below the protective door; a centering mechanism is installed in the holding device, the centering mechanism is matched with the unmanned aerial vehicle to guide the unmanned aerial vehicle to land into the holding device, a power supply unit and a control unit are further installed in the moving bin, the power supply unit is electrically connected with the control unit, and the control unit is electrically connected with the suspension arm mechanism, the umbilical cable and the holding device. And a docking mechanism connected with the unmanned aerial vehicle is mounted at the tail end of the umbilical cable. The unmanned aerial vehicle hangar can meet the requirement for detection in a deep well or a deep hole of an unmanned aerial vehicle, the unmanned aerial vehicle can smoothly enter the deep well or the deep hole for operation, and smooth recovery can be guaranteed.

The application relates to the technical field of underwater communication and signal processing, and provides an anti-interference method for underwater power carrier communication, which comprises the following steps: acquiring a power carrier time-frequency signal received by an SRM and synchronously collecting a control instruction stream, wherein the power carrier time-frequency signal is an OFDM signal; determining a state perception weight matrix based on a relay action time window, wherein the relay action time window is determined based on the control instruction stream; determining a joint optimization problem provided with a phase distortion correction operator based on the power carrier time-frequency signal, the state perception weight matrix and a frequency domain confidence matrix in combination with a double-weighted robust principal component analysis algorithm, wherein the frequency domain confidence matrix is determined based on the high-frequency attenuation characteristics of an underwater umbilical cable; and solving the joint optimization problem based on a linearized alternating direction multiplier method to determine a target power carrier signal. The application solves the problem that reliable communication cannot be realized under the double constraints of strong interference and severe phase jitter in the related art.

The application discloses a wave compensation system and method for umbilical cable deployment of engineering ships, and belongs to the technical field of umbilical cable tension control. The system comprises a winch mechanism, a cable arrangement mechanism, a compensation mechanism and a detection and control unit. The compensation mechanism adopts a double-layer parallelogram winding structure composed of four pulleys, and the path length of the umbilical cable is changed by driving the pulley frame to move through a linear composite oil cylinder. The system adopts a hybrid compensation strategy combining passive compensation and active compensation. The passive compensation utilizes the energy storage characteristics of the accumulator to achieve rapid response to high-frequency wave disturbance, and the active compensation realizes compensation accuracy correction through feedforward control and feedback control. The controller monitors the pulley displacement and controls the winch to wind or unwind the cable when the threshold is exceeded, thereby expanding the effective compensation range of the system. The cable arrangement mechanism and the winch are synchronized to ensure that the umbilical cable is uniformly arranged on the drum. The application realizes stable umbilical cable tension in complex sea conditions, and provides a more reasonable solution for underwater deployment.

The invention relates to the technical field of strength tensile tests, and discloses an umbilical cable and bearing head connection strength tensile test device which comprises a base, a top support, two jacking oil cylinders and a booster pump. The bottom of the base is formed by welding and splicing multiple sections of H-shaped steel, stand columns are fixedly connected to the positions, close to the two sides, of the top end of the base, the top support applies upward tensile force to the bearing head through the first lifting lug and the tension sensor, the armored umbilical cable in the to-be-detected assembly is subjected to axial tensile force accordingly, and meanwhile the connecting axis of the second lifting lug and the tension sensor is connected with the bearing head. The first lifting lug and the connecting axis of the to-be-detected assembly are collinear, the stability of the overall structure of the test device and the coaxiality in the tensile force direction are guaranteed, detection errors caused by device shaking or stress deviation in the test process are avoided, and structural support is provided for safe and stable development of the tensile test.

The utility model relates to umbilical cable technical field discloses a kind of umbilical cable clamping devices, including fixed plate, two fixed plates are provided, one of the two fixed plates is fixedly connected with servo motor at front end, the end of the mutual approach of two fixed plates is provided with pivot, the output end of the rear end of servo motor is connected with the front end of pivot through inside of one of fixed plate, the rear end of pivot is fixedly connected with cable reel front end.The utility model starts servo motor, the output end of servo motor starts rotation, the output end of the rear end of servo motor is connected with the front end of pivot through inside of one of fixed plate, so the rotation power of servo motor will be transferred to pivot, the rear end of pivot is fixedly connected with cable reel front end, the rotation of pivot will drive cable reel to rotate.Cable reel inner wall is connected with the transmission of the right end of clamping band, with the rotation of cable reel, clamping band will be driven to start movement, clamping band left end is fixed on the surface of cable reel column.

The invention relates to the technical field of deepwater oil gas and combustible ice exploitation testing, and discloses an underwater test tree and check valve electro-hydraulic compound control system and method. The system comprises a ground control terminal, an umbilical cable transmission system, a ground emergency control system, an underwater energy accumulator system, an actuator control system, a pressure compensation control system, a check valve and an underwater test tree. An instruction is sent through a ground control terminal, an electromagnetic reversing valve is controlled through an umbilical cable, then a plurality of hydraulic control reversing valves are controlled, high-pressure hydraulic oil of an underwater energy accumulator set is input into an underwater test tree and a check valve, and a ground emergency control system can directly control the underwater test tree to complete a release task through the hydraulic control reversing valves. Electro-hydraulic compound control of the underwater test tree and the check valve by the ground is realized, the problems of low system response speed, disordered control circuit and poor safety are effectively solved, the system has the characteristics of high reliability, high fault resistance, convenience in maintenance and the like, and the safety of deepwater test operation is guaranteed.

This application relates to the field of auxiliary hoisting technology for underwater operation equipment, and discloses a high-stability anti-sway device and its method. The anti-sway device is installed as a whole on the ship deck and fixedly connected to the A-frame beam. It consists of a swing mechanism, a main column assembly, a base assembly, an anti-sway pulley assembly, and an electro-hydraulic coordination system. The swing mechanism integrates a multi-link structure, a lateral cylinder, and a swing cylinder, which can realize the equipment's pitching, rolling, and cable-guided swinging movements, respectively. The main column assembly has a built-in rotary linkage structure, which can work with the rotary drive to complete the horizontal angle adjustment of the whole machine. The base assembly is equipped with shock-absorbing wheels, connecting guides, and a locking structure, which can achieve precise docking with ROV and oil cut-off self-locking protection. The anti-sway pulley assembly can guide and limit the umbilical cable and the bending limiter.

The invention discloses a CFD-based wave glider multi-body dynamics simulation method and system, and the method comprises the steps: building an umbilical cable flexible dynamics equation through employing a concentrated mass method, and obtaining an umbilical cable flexible wave glider rigid-flexible coupling dynamics model through employing a floating body and submerged body dynamics equation as a boundary condition; the method comprises the following steps: constructing a geometric model of a floating body, a submerged body and a hydrofoil, creating a background fluid domain, carrying out regional division on the background fluid domain and the geometric model by utilizing Boolean operation, and constructing a hydrofoil-seawater bidirectional fluid-solid coupling CFD simulation model of the wave glider; building a co-simulation interface based on MATLAB-Fluent, executing time domain co-simulation and iterative updating based on the co-simulation interface, and obtaining power data in the operation process of the wave glider; according to the method, the flexible effect of the umbilical cable and the hydrofoil is introduced into the dynamic model of the wave glider, high-precision fluid-solid coupling of seawater and a structure is realized based on CFD, and the kinematics and dynamics behavior prediction precision in the operation process of the wave glider is improved.

The invention discloses an aircraft semi-submersible type laying device and an application method, and relates to the field of aircraft laying platform design. The aircraft semi-submersible type laying device comprises a base fixedly connected with the bottom of a water body through a plurality of anchor chains; the arrangement cabin is connected with the base through an umbilical cable; the communication module is used for carrying out docking communication with an aircraft; wherein the communication module is internally provided with a control unit which is in communication connection with the execution mechanism in the arrangement cabin and the communication module; the communication module is arranged at any one of the base and the arrangement cabin, and the communication module floats on the water surface through an independent buoyancy air bag; and a winding mechanism for adjusting the length of the umbilical cable is arranged on the base or below the arrangement cabin. The mobile arrangement cabin is adopted, and the unmanned aerial vehicle can actively move to the position near the water surface, so that the unmanned aerial vehicle does not need to carry out cross-medium work and repeated attitude correction, the unmanned aerial vehicle laying and recycling speed is higher, and the working efficiency is higher.

The application discloses a kind of umbilical cable complex environment simulation test devices for deep-sea mining, the device includes test box, ocean current simulation mechanism, vibration mechanism, guide mechanism, test piece installation mechanism, wind load simulation mechanism, monitoring component and temperature control mechanism.Test box inner cavity fills sea water solution to simulate seawater environment;Ocean current simulation mechanism is communicated with test box inner cavity, for driving sea water solution to produce controlled circulation flow to simulate deep-sea ocean current load;Vibration mechanism is set at the top of test box, for producing multi-degree-of-freedom vibration to simulate ship body movement load;Guide mechanism is arranged on the bearing surface of vibration mechanism, and the direction of test piece is guided by rolling element;Test piece installation mechanism is used to lock the two ends of test piece and apply controllable tension;Wind load simulation mechanism is towards test piece to simulate wind load;Monitoring component real-time acquisition environmental parameter and test piece state parameter;Temperature control mechanism is immersed in sea water solution to adjust temperature to simulate deep-sea temperature environment.

The application relates to an underwater pipeline emergency unblocking system capable of rapid sealing butt joint, and belongs to the field of marine engineering equipment, comprising a cylinder, a quick joint, a power driving module and a drilling and liquid spraying module, wherein the quick joint is used for butt joint of an upper umbilical cable and a lower umbilical cable, and the two are connected into a long umbilical cable; the power driving module is used for pushing the drilling and liquid spraying module to a blockage point in the underwater pipeline; and the drilling and liquid spraying module is used for unblocking operation on the blockage point. The underwater pipeline emergency unblocking system has the advantages of automatic operation, drilling, monitoring, medicine injection and the like, is quick in unblocking, low in energy consumption and the like, and is especially suitable for pipeline unblocking scenes where a deep water underwater pipeline inhibitor is difficult to reach the blockage point.

The invention provides an umbilical cable multi-axis loading fatigue testing device for deep-sea mining. The umbilical cable multi-axis loading fatigue testing device comprises a frame; the fatigue test assembly is arranged in the frame; the device is used for installing a test piece and comprises a tension-torsion loading mechanism of which the action end is connected with the bottom of the test piece and which is used for applying an axial tension load and a torsion load to the test piece; the deformation loading mechanisms are arranged in the circumferential direction of the test piece, and the telescopic end of each deformation loading mechanism can independently stretch out to apply transverse displacement to different parts of the test piece, so that the test piece is bent and deformed; the internal pressurizing mechanism is communicated with the interior of the test piece and is used for applying pressure to the interior of the test piece; and the upper computer is linked with the fatigue test assembly so as to control the on-off and operation of the fatigue test assembly.

The invention provides an umbilical cable. The umbilical cable comprises a central main body structure which comprises an optical unit, an electric unit, a transmission unit, a first hollow buffer structure and a second hollow buffer structure; the protection structure comprises a first sheath, and the periphery of the central main body structure is coated with the first sheath; wherein the conveying unit and the electric unit define a first containing space, the conveying unit and the first sheath define a second containing space, the first containing space and the second containing space are arranged at intervals in the circumferential direction of the umbilical cable, and the first hollow buffer structure is arranged in the first containing space; the second hollow buffer structure and the optical unit are both arranged in the second accommodating space, and the second hollow buffer structure is configured to be capable of wrapping at least part of the optical unit. According to the technical scheme, the umbilical cable can solve the problems that an existing umbilical cable is poor in impact resistance and flattening resistance and prone to being damaged, and consequently the maintenance cost is high.

The utility model relates to an umbilical cable capable of reducing compressive load of an optical cable. The umbilical cable comprises a sheath layer; an armor layer, wherein the sheath layer is coated on the armor layer; a cable layer; a supporting layer, wherein the cable layer is coated on the supporting layer; the optical cable layer is located between the armor layer and the cable layer, the optical cable layer comprises a plurality of first optical cables and a plurality of first separators, the first optical cables and the first separators are located between the armor layer and the cable layer, the first separators abut against the armor layer and the cable layer, and the first separators abut against the armor layer and the cable layer. The first optical cable abuts against the first separator, a containing space is formed between the cable layer and the armor layer, the first optical cable is located in the containing space, and a gap exists between the first optical cable and the side wall of the containing space. The umbilical cable capable of reducing the compressive load of the optical cable can reduce the compressive load of the optical cable and prevent the optical cable from being damaged.

The application provides a kind of spatio-temporal structure sparse light coding deep water heterogeneous network data synchronization method and system, including based on the overcomplete dictionary trained, the time sequence clock deviation data of each underwater node in the sending terminal equipment of deep water heterogeneous network is sparsely decomposed, and the original sparse vector is obtained;After the dynamic compressed observation data corresponding to the original sparse vector is converted into optical signal, it is transmitted to the receiving terminal equipment of deep water heterogeneous network by umbilical cable by sending terminal equipment;After the optical signal is demodulated into observation vector by receiving terminal equipment, it is input into the trained deep unfolding network model, and the reconstructed sparse vector is output by deep unfolding network model;The reconstructed sparse vector is recovered into clock deviation signal by overcomplete dictionary, and clock synchronization calibration instruction is generated, to realize the data synchronization of corresponding underwater node.The application can solve the problems of high bandwidth occupation, low signal ratio and poor reconstruction timeliness in underwater network time synchronization technology.

The invention discloses an underwater saturated diving shuttle cabin system, and belongs to the technical field of saturated diving, a steel rail is laid at the bottom of a deep water tunnel in advance, a wheel set mechanism is arranged below a diving bell, the wheel set mechanism can roll along the steel rail to drive the diving bell to move back and forth in the deep water tunnel, and a pulley is hung on the lower portion of a floating ball. One end of the umbilical cable is connected with an air distribution and supply system on the water surface, and the other end of the umbilical cable sequentially penetrates through the pulleys connected with the floating ball and then is connected into the diving bell. According to the underwater saturated diving shuttle cabin system, a traditional saturated diving bell is improved according to the characteristics of a deepwater tunnel, and the underwater saturated diving shuttle cabin system is creatively designed. The diving bell is fixed on the wheel set mechanism, the wheel set mechanism can carry the diving bell to move back and forth on the steel rail, the umbilical cable is connected to the air distribution and supply system on the water surface through the pulley below the floating ball, and the buoyancy of the floating ball can ensure that the whole umbilical cable is in a suspended state and is not scratched by the water bottom.

A kind of probe for underwater pipeline depth electromagnetic method measurement and electromagnetic measurement method.The present application applies a three-component orthogonal coil group installed in a non-metallic material shell as a measurement sensor of electromagnetic signal, and a three-dimensional electronic compass, together with an embedded circuit board to form a measurement probe, for electromagnetic measurement of the position and depth of covering of underwater steel pipelines and cables.The probe is lowered into the water through a telescopic connecting rod, and is connected to a main device on the equipment of a mother ship by a umbilical cable, which is responsible for parameter setting and display and storage of measurement results.During the detection process, the probe is towed vertically along the pipeline by the mother ship in the form of a towfish, and the azimuth angle data measured by the compass are uploaded to the main device, which calculates the position of the target pipeline and the thickness of the covering layer.The present application can be widely applied to the measurement of the position and depth of covering of underwater steel pipelines and cables in rivers and oceans.

The following type water surface control floating platform comprises an underwater robot and a control unit which are connected through an umbilical cable, the control unit is fixed to a cable bin assembly, the cable bin assembly is rotationally arranged at the top of an operation floating platform, and the operation floating platform floats on the water surface through three sets of buoyancy plates arranged at the bottom in an annular array; a control mechanism is arranged between the top of the buoyancy plate and the operation floating platform and comprises three sets of driving motors arranged on an outer ring of the operation floating platform in an annular array mode, planet wheels and a single set of outer gear rings, the three sets of planet wheels are meshed with the inner ring faces of the outer gear rings, and the sides, away from the outer gear rings, of the planet wheels are in transmission connection with the cable bin assembly. By synchronously controlling the floating platform to take up and pay off the cable body and efficiently controlling the floating platform to rotate on the water surface, the problem of torsion of the cable body is solved quickly, and meanwhile torsion monitoring of the cable body is effectively achieved.

The application provides a flexible replenishment pipe deep water rubble bed leveling equipment and a use method thereof, which comprises a mother ship and an underwater leveling frame, the mother ship and the leveling frame are connected through a flexible replenishment hose and multiple umbilical cables, a moving mechanism is arranged on the leveling frame, and a riprap pipe is arranged on the moving mechanism. The overall device is a mother ship, underwater leveling frame and flexible replenishment hose scheme, the influence of the harsh environment of the open sea deep water area on the leveling precision is avoided, the scheme can be applied to 100-meter deep water. The flexible hose is used as the flexible replenishment scheme, and the underwater accurate replenishment is realized. The mother ship and the leveling frame can move to realize high-precision positioning, the positioning frame can check the information of the leveled frame after positioning, and the positioning precision is further improved. The moving mechanism on the leveling frame can uniformly feed the rubble, and the material level is kept stable. The riprap pipe is used for separating the rubble and water in the flexible replenishment hose, the riprap pipe is suitable for the rotation and movement angle of the leveling frame, and is suitable for popularization and use.

The invention provides an offshore construction umbilical cable dragging head protection frame, and relates to the technical field of offshore construction, the offshore construction umbilical cable dragging head protection frame comprises a reinforcing table top, the bottom of the reinforcing table top is fixedly connected with a supporting stand column, and the reinforcing table top is of an arc-shaped structure so as to be matched with a large reel pipe disc loaded by an engineering ship. The reinforcing table board is designed to be arc-shaped so as to adapt to a large reel pipe disc loaded by an engineering ship. Through cooperation of the reinforcing table board and the supporting stand column, a storage space is reserved for the umbilical cable dragging head, so that the umbilical cable dragging head is protected and is prevented from being extruded by the umbilical cable in the processes of inverting, transporting and laying the umbilical cable, the umbilical cable is evenly distributed in the cable winding disc and is not prone to being damaged, and stable transportation of the umbilical cable dragging head is guaranteed. Meanwhile, an umbilical cable pre-debugging worker can test and monitor the light reflection time domain, conductor resistance, insulation resistance and the like of the umbilical cable dragging head in the loading, transporting and laying period of the umbilical cable, and the problem that in the prior art, testing can only be carried out after laying is completed is solved.

An umbilical cable cutting device for disconnecting the electrical and communication connections between an aircraft and power supply and / or control unit located outside the guide tube. includes a base plate with opening receiving the umbilical cable and another rectangular opening behind the first opening, the second opening accommodating a flat cutter and drive mechanism, the base plate upper surface having a cutting groove from the middle of the second opening extending laterally and through the first opening toward the base plate’s front edge; The cutter is mounted in the cutter track and moves in the track by a drive mechanism, the drive mechanism includes a push pin to rest on the flying device’s push pin. When the flying device is launched, the flying device’s push pin pushes the drive mechanism’s push trigger of the to cause the flat cutter to move forward to cut the umbilical cable.

The application provides a low-altitude networking coverage platform, which comprises a mobile operation device and a small unmanned aerial vehicle, the mobile operation device comprises a first machine body and a first control system, and the first control system is arranged on the first machine body; the small unmanned aerial vehicle comprises a second machine body and a second control system, and the second control system is arranged on the second machine body; and the first machine body and the second machine body are connected through an umbilical cable. The application also provides a low-altitude networking coverage method, which comprises the following steps: obtaining low-altitude networking coverage requirements; determining a fixed position of a large unmanned aerial vehicle according to a signal coverage range of the large unmanned aerial vehicle and the low-altitude networking coverage requirements; controlling the large unmanned aerial vehicle to stay at the fixed position; and controlling a small unmanned aerial vehicle to perform low-altitude networking coverage. The application can flexibly and reliably meet complex and severe emergency communication requirements and realize low-altitude coverage networking.

A submarine cable salvage method, using an underwater remote control robot to carry a clamp to hold the cable, and then releasing a composite rope, a mushroom anchor, a cable salvage hook and the like for recycling the cable clamp into water, the mushroom anchor is not in the same time with the cable clamp and the underwater remote control robot, compared with the prior art, can avoid binding the rope on the umbilical cable of the underwater remote control robot, does not need to operate the underwater remote control robot and the cable clamp connected with the umbilical cable and its rope at the same time, greatly reduces the risk of rope winding with the umbilical cable, the three times of diving of the underwater remote control robot are separately diving and operating, greatly reduces the operation requirements of the deck operator and the ship operator, and reduces the operation risk of the underwater remote control robot. In addition, the ship operation is more free, mainly considering the influence of the blow flow, if the blow flow is opened, the risk will be smaller.